diff --git a/examples/adder.net b/examples/adder.net
index ae58fe0..17cde54 100644
Binary files a/examples/adder.net and b/examples/adder.net differ
diff --git a/examples/adderFromScratch.cpp b/examples/adderFromScratch.cpp
index f7ed63e..da133ec 100644
--- a/examples/adderFromScratch.cpp
+++ b/examples/adderFromScratch.cpp
@@ -10,9 +10,9 @@
 using namespace neuralpp;
 
 int main()  {
-	NeuralNet *net = new NeuralNet(2, 2, 1, -0.005, 10000);
+	NeuralNet net(2, 2, 1, 0.005, 10000);
 	string xml;
-	float tmp;
+	double tmp;
 
 	// XML initialization. Then, I say XML that 2+3=5, 3+3=6, 5+4=9
 	// Strings' format is "input1,input2,...,inputn;output1,output2,...,outputm
@@ -22,8 +22,8 @@ int main()  {
 	xml += NeuralNet::XMLFromSet(2, "5,4;9");
 	NeuralNet::closeXML(xml);
 	
-	net->train(xml, NeuralNet::str);
-	vector<float> v;
+	net.train(xml, NeuralNet::str);
+	vector<double> v;
 	cout << "Network status: trained\n\n";
 
 	cout << "First number to add: ";
@@ -34,9 +34,9 @@ int main()  {
 	cin >> tmp;
 	v.push_back(tmp);
 
-	net->setInput(v);
-	net->propagate();
-	cout << "Output: " << net->getOutput() << endl;
+	net.setInput(v);
+	net.propagate();
+	cout << "Output: " << net.getOutput() << endl;
 	return 0;
 }
 
diff --git a/examples/doAdd.cpp b/examples/doAdd.cpp
index 2203d3c..9b6d3ee 100644
--- a/examples/doAdd.cpp
+++ b/examples/doAdd.cpp
@@ -12,11 +12,11 @@ using namespace neuralpp;
 #define	NETFILE	"adder.net"
 
 int main()  {
-	float a,b;
-	NeuralNet *net = NULL;
+	double a,b;
+	NeuralNet net;
 
 	try  {
-		net = new NeuralNet(NETFILE);
+		net = NeuralNet(NETFILE);
 	}
 
 	catch (NetworkFileNotFoundException e)  {
@@ -30,13 +30,13 @@ int main()  {
 	cout << "Second number to add: ";
 	cin >> b;
 
-	vector<float> v;
+	vector<double> v;
 	v.push_back(a);
 	v.push_back(b);
 
-	net->setInput(v);
-	net->propagate();
-	cout << "Neural net output: " << net->getOutput() << endl;
+	net.setInput(v);
+	net.propagate();
+	cout << "Neural net output: " << net.getOutput() << endl;
 
 	return 0;
 }
diff --git a/examples/learnAdd.cpp b/examples/learnAdd.cpp
index 2ea674c..157e960 100644
--- a/examples/learnAdd.cpp
+++ b/examples/learnAdd.cpp
@@ -11,12 +11,12 @@
 using namespace neuralpp;
 
 int main()  {
-	NeuralNet *net = new NeuralNet (2, 2, 1, -0.005, 10000);
+	NeuralNet net(2, 2, 1, 0.005, 10000);
 
 	cout << "Training in progress - This may take a while...if it gets stuck, interrupt and restart the app\n";
-	net->train("adder.xml", NeuralNet::file);
+	net.train("adder.xml", NeuralNet::file);
 
-	net->save("adder.net");
+	net.save("adder.net");
 	cout << "Network trained. You can use adder.net file now to load this network\n";
 	return 0;
 }
diff --git a/include/neural++.hpp b/include/neural++.hpp
index 85d6e7e..e915dca 100644
--- a/include/neural++.hpp
+++ b/include/neural++.hpp
@@ -30,7 +30,7 @@ using namespace std;
 
 namespace neuralpp  {
 	//! Default rand value: |sin(rand)|, always >= 0 and <= 1
-	#define	RAND		( (float) abs( sinf((float) rand()) ) )
+	#define	RAND		( (double) abs( sinf((double) rand()) ) )
 	
 	class Synapsis;
 	class Neuron;
@@ -46,8 +46,8 @@ namespace neuralpp  {
 	class NeuralNet  {
 		int epochs;
 		int ref_epochs;
-		float l_rate;
-		float ex;
+		double l_rate;
+		double ex;
 
 		Layer* input;
 		Layer* hidden;
@@ -71,10 +71,10 @@ namespace neuralpp  {
 		 * @param Expected value
 		 * @return Mean error
 		 */
-		float error(float);
+		double error(double);
 		
-		float (*actv_f)(float);
-		float (*deriv)(float);
+		double (*actv_f)(double);
+		double (*deriv)(double);
 
 	public:
 		/**
@@ -94,7 +94,7 @@ namespace neuralpp  {
 		 * @param e Epochs (cycles) to execute (the most you execute, the most the network
 		 *   can be accurate for its purpose)
 		 */
-		NeuralNet (size_t, size_t, size_t, float, int);
+		NeuralNet (size_t, size_t, size_t, double, int);
 
 		/**
 		 * @brief Constructor
@@ -116,29 +116,29 @@ namespace neuralpp  {
 		 * @param e Epochs (cycles) to execute (the most you execute, the most the network
 		 *   can be accurate for its purpose)
 		 */
-		NeuralNet (size_t, size_t, size_t, float(*)(float), float(*)(float), float, int);
+		NeuralNet (size_t, size_t, size_t, double(*)(double), double(*)(double), double, int);
 
 		/**
 		 * @brief It gets the output of the network (note: the layer output should contain
 		 *   an only neuron)
 		 */
-		float getOutput();
+		double getOutput();
 
 		/**
 		 * @brief It gets the output of the network in case the output layer contains more neurons
 		 */
-		vector<float> getVectorOutput();
+		vector<double> getVectorOutput();
 
 		/**
 		 * @brief It gets the value expected. Of course you should specify this when you
 		 *   build your network by using setExpected.
 		 */
-		float expected();
+		double expected();
 
 		/**
 		 * @brief It sets the value you expect from your network
 		 */
-		void setExpected(float);
+		void setExpected(double);
 
 		/**
 		 * @brief It updates through back-propagation the weights of the synapsis and
@@ -155,9 +155,9 @@ namespace neuralpp  {
 
 		/**
 		 * @brief It sets the input for the network
-		 * @param v Vector of floats, containing the values to give to your network
+		 * @param v Vector of doubles, containing the values to give to your network
 		 */
-		void setInput (vector<float>&);
+		void setInput (vector<double>&);
 
 		/**
 		 * @brief It links the layers of the network (input, hidden, output). Don't use unless
@@ -186,12 +186,12 @@ namespace neuralpp  {
 		static void initXML (string&);
 
 		/**
-		 * @brief Splits a string into a vector of floats, given a delimitator
+		 * @brief Splits a string into a vector of doubles, given a delimitator
 		 * @param delim Delimitator
 		 * @param str String to be splitted
-		 * @return Vector of floats containing splitted values
+		 * @return Vector of doubles containing splitted values
 		 */
-		static vector<float> split (char, string);
+		static vector<double> split (char, string);
 
 		/**
 		 * @brief Get a training set from a string and copies it to an XML
@@ -220,17 +220,17 @@ namespace neuralpp  {
 	 *  you're doing, use NeuralNet instead
 	 */
 	class Synapsis  {
-		float delta;
-		float weight;
+		double delta;
+		double weight;
 
 		Neuron *in;
 		Neuron *out;
 		
-		float (*actv_f)(float);
-		float (*deriv)(float);
+		double (*actv_f)(double);
+		double (*deriv)(double);
 
 	public:
-		Synapsis(Neuron* i, Neuron* o, float w, float d)  {
+		Synapsis(Neuron* i, Neuron* o, double w, double d)  {
 			in=i; out=o;
 			weight=w; delta=d;
 		}
@@ -242,7 +242,7 @@ namespace neuralpp  {
 		 * @param a Activation function
 		 * @param d Derivate for activation function
 		 */
-		Synapsis (Neuron* i, Neuron* o, float(*)(float), float(*)(float));
+		Synapsis (Neuron* i, Neuron* o, double(*)(double), double(*)(double));
 		
 		/**
 		 * @brief Constructor
@@ -252,7 +252,7 @@ namespace neuralpp  {
 		 * @param a Activation function
 		 * @param d Derivate for activation function
 		 */
-		Synapsis (Neuron* i, Neuron* o, float w, float(*)(float), float(*)(float));
+		Synapsis (Neuron* i, Neuron* o, double w, double(*)(double), double(*)(double));
 	
 		/**
 		 * @return Reference to input neuron of the synapsis
@@ -267,23 +267,23 @@ namespace neuralpp  {
 		/**
 		 * @brief It sets the weight of the synapsis
 		 */
-		void setWeight(float);
+		void setWeight(double);
 		
 		/**
 		 * @brief It sets the delta (how much to change the weight after an update) 
 		 *  of the synapsis
 		 */
-		void setDelta(float);
+		void setDelta(double);
 
 		/**
 		 * @return Weight of the synapsis
 		 */
-		float getWeight();
+		double getWeight();
 		
 		/**
 		 * @return Delta of the synapsis
 		 */
-		float getDelta();
+		double getDelta();
 	};
 
 	/**
@@ -292,26 +292,26 @@ namespace neuralpp  {
 	 *  you're doing, use NeuralNet instead
 	 */
 	class Neuron  {
-		float actv_val;
-		float prop_val;
+		double actv_val;
+		double prop_val;
 
 		vector< Synapsis > in;
 		vector< Synapsis > out;
 
-		float (*actv_f)(float);
-		float (*deriv)(float);
+		double (*actv_f)(double);
+		double (*deriv)(double);
 	public:
 		/**
 		 * @brief Constructor
 		 * @param a Activation function
 		 * @param d Its derivate
 		 */
-		Neuron (float (*)(float), float(*)(float));
+		Neuron (double (*)(double), double(*)(double));
 
 		/**
 		 * @brief Alternative constructor, that gets also the synapsis linked to the neuron
 		 */
-		Neuron (vector< Synapsis >, vector< Synapsis >, float (*)(float), float(*)(float));
+		Neuron (vector< Synapsis >, vector< Synapsis >, double (*)(double), double(*)(double));
 
 		/**
 		 * @brief Gets the i-th synapsis connected on the input of the neuron
@@ -336,27 +336,27 @@ namespace neuralpp  {
 		/**
 		 * @brief Change the activation value of the neuron
 		 */
-		void setActv (float);
+		void setActv (double);
 
 		/**
 		 * @brief Change the propagation value of the neuron
 		 */
-		void setProp (float);
+		void setProp (double);
 
 		/**
 		 * @brief It gets the activation value of the neuron
 		 */
-		float getActv();
+		double getActv();
 		
 		/**
 		 * @brief It gets the propagation value of the neuron
 		 */
-		float getProp();
+		double getProp();
 
 		/**
 		 * @brief It propagates its activation value to the connected neurons
 		 */
-		float propagate();
+		double propagate();
 
 		/**
 		 * @return Number of input synapsis
@@ -383,8 +383,8 @@ namespace neuralpp  {
 		vector< Neuron > elements;
 		void (*update_weights)();
 
-		float (*actv_f)(float);
-		float (*deriv)(float);
+		double (*actv_f)(double);
+		double (*deriv)(double);
 
 	public:
 		/**
@@ -393,13 +393,13 @@ namespace neuralpp  {
 		 * @param a Activation function
 		 * @param d Its derivate
 		 */
-		Layer (size_t sz, float (*)(float), float(*)(float));
+		Layer (size_t sz, double (*)(double), double(*)(double));
 
 		/**
 		 * @brief Alternative constructor. It directly gets a vector of neurons to build
 		 *  the layer
 		 */
-		Layer (vector< Neuron >&, float(*)(float), float(*)(float));
+		Layer (vector< Neuron >&, double(*)(double), double(*)(double));
 
 		/**
 		 * @brief Redefinition for operator []. It gets the neuron at <i>i</i>
@@ -416,13 +416,13 @@ namespace neuralpp  {
 		 * @brief It sets a vector of propagation values to all its neurons
 		 * @param v Vector of values to write as propagation values
 		 */
-		void setProp (vector<float>&);
+		void setProp (vector<double>&);
 		 
 		/** 
 		 * @brief It sets a vector of activation values to all its neurons
 		 * @param v Vector of values to write as activation values
 		 */
-		void setActv (vector<float>&);
+		void setActv (vector<double>&);
 
 		/**
 		 * @brief It propagates its activation values to the output layers
@@ -441,18 +441,18 @@ namespace neuralpp  {
 		int output_size;
 
 		int epochs;
-		float l_rate;
-		float ex;
+		double l_rate;
+		double ex;
 	};
 
 	struct neuronrecord  {
-		float prop;
-		float actv;
+		double prop;
+		double actv;
 	};
 
 	struct synrecord  {
-		float w;
-		float d;
+		double w;
+		double d;
 	};
 }
 
diff --git a/src/layer.cpp b/src/layer.cpp
index c41370a..46de72d 100644
--- a/src/layer.cpp
+++ b/src/layer.cpp
@@ -21,7 +21,7 @@ using namespace neuralpp;
  * @param a Activation function
  * @param d Its derivate
  */
-Layer::Layer (size_t sz, float(*a)(float), float(*d)(float))  {
+Layer::Layer (size_t sz, double(*a)(double), double(*d)(double))  {
 	for (size_t i=0; i<sz; i++)  {
 		Neuron n(a,d);
 		elements.push_back(n);
@@ -35,7 +35,7 @@ Layer::Layer (size_t sz, float(*a)(float), float(*d)(float))  {
  * @brief Alternative constructor. It directly gets a vector of neurons to build
  *  the layer
  */
-Layer::Layer (vector< Neuron > &el, float (*a)(float), float(*d)(float))  {
+Layer::Layer (vector< Neuron > &el, double (*a)(double), double(*d)(double))  {
 	elements=el;
 	actv_f=a;
 	deriv=d;
@@ -75,7 +75,7 @@ void Layer::link (Layer& l)  {
  * @brief It sets a vector of propagation values to all its neurons
  * @param v Vector of values to write as propagation values
  */
-void Layer::setProp (vector<float> &v)  {
+void Layer::setProp (vector<double> &v)  {
 	for (size_t i=0; i<size(); i++)
 		elements[i].setProp(v[i]);
 }
@@ -84,7 +84,7 @@ void Layer::setProp (vector<float> &v)  {
  * @brief It sets a vector of activation values to all its neurons
  * @param v Vector of values to write as activation values
  */
-void Layer::setActv (vector<float> &v)  {
+void Layer::setActv (vector<double> &v)  {
 	for (size_t i=0; i<size(); i++)
 		elements[i].setActv(v[i]);
 }
diff --git a/src/neuralnet.cpp b/src/neuralnet.cpp
index 55caba9..5f6ac33 100644
--- a/src/neuralnet.cpp
+++ b/src/neuralnet.cpp
@@ -19,12 +19,12 @@ using namespace neuralpp;
 /**
  * @brief Built-in function. The default activation function: f(x)=x
  */
-float __actv(float prop)  { return prop; }
+double __actv(double prop)  { return prop; }
 
 /**
  * @brief Default derivate for default activation function: f'(x)=1
  */
-float __deriv(float prop) { return 1; }
+double __deriv(double prop) { return 1; }
 
 /**
  * @brief Constructor
@@ -36,7 +36,7 @@ float __deriv(float prop) { return 1; }
  * @param e Epochs (cycles) to execute (the most you execute, the most the network
  *   can be accurate for its purpose)
  */
-NeuralNet::NeuralNet (size_t in_size, size_t hidden_size, size_t out_size, float l, int e)  {
+NeuralNet::NeuralNet (size_t in_size, size_t hidden_size, size_t out_size, double l, int e)  {
 	epochs=e;
 	ref_epochs=epochs;
 	l_rate=l;
@@ -62,7 +62,7 @@ NeuralNet::NeuralNet (size_t in_size, size_t hidden_size, size_t out_size, float
  *   can be accurate for its purpose)
  */
 NeuralNet::NeuralNet (size_t in_size, size_t hidden_size, size_t out_size,
-		float(*a)(float), float(*d)(float), float l, int e)  {
+		double(*a)(double), double(*d)(double), double l, int e)  {
 	epochs=e;
 	ref_epochs=epochs;
 	l_rate=l;
@@ -80,13 +80,13 @@ NeuralNet::NeuralNet (size_t in_size, size_t hidden_size, size_t out_size,
  * @brief It gets the output of the network (note: the layer output should contain
  *   an only neuron)
  */
-float NeuralNet::getOutput()  { return (*output)[0].getActv(); }
+double NeuralNet::getOutput()  { return (*output)[0].getActv(); }
 
 /**
  * @brief It gets the output of the network in case the output layer contains more neurons
  */
-vector<float> NeuralNet::getVectorOutput()  {
-	vector<float> v;
+vector<double> NeuralNet::getVectorOutput()  {
+	vector<double> v;
 
 	for (size_t i=0; i<output->size(); i++)
 		v.push_back( (*output)[i].getActv() );
@@ -98,7 +98,7 @@ vector<float> NeuralNet::getVectorOutput()  {
  * @param Expected value
  * @return Mean error
  */
-float NeuralNet::error(float expected)  {
+double NeuralNet::error(double expected)  {
 	return abs( (getOutput() - expected*
 		deriv(getOutput())) / (abs(expected)) );
 }
@@ -114,9 +114,9 @@ void NeuralNet::propagate()  {
 
 /**
  * @brief It sets the input for the network
- * @param v Vector of floats, containing the values to give to your network
+ * @param v Vector of doubles, containing the values to give to your network
  */
-void NeuralNet::setInput(vector<float>& v)  {
+void NeuralNet::setInput(vector<double>& v)  {
 	input->setProp(v);
 	input->setActv(v);
 }
@@ -133,38 +133,38 @@ void NeuralNet::link()  {
 /**
  * @brief It sets the value you expect from your network
  */
-void NeuralNet::setExpected(float e)  { ex=e; }
+void NeuralNet::setExpected(double e)  { ex=e; }
 
 /**
  * @brief It gets the value expected. Of course you should specify this when you
  *   build your network by using setExpected.
  */
-float NeuralNet::expected()  { return ex; }
+double NeuralNet::expected()  { return ex; }
 
 /**
  * @brief It updates the weights of the net's synapsis through back-propagation.
  *   In-class use only
  */
 void NeuralNet::updateWeights()  {
-	float out_delta;
+	double out_delta;
 
 	for (size_t i=0; i<output->size(); i++)  {
 		Neuron *n = &(*output)[i];
 
 		for (size_t j=0; j<n->nIn(); j++)  {
 			Synapsis *s = &(n->synIn(j));
-			out_delta = s->getIn()->getActv() * error(ex) * l_rate;
+			out_delta = s->getIn()->getActv() * error(ex) * (-l_rate);
 			s->setDelta(out_delta);
 		}
 	}
 
 	for (size_t i=0; i<hidden->size(); i++)  {
 		Neuron *n = &(*hidden)[i];
-		float d = deriv(n->getProp()) * n->synOut(0).getWeight() * out_delta;
+		double d = deriv(n->getProp()) * n->synOut(0).getWeight() * out_delta;
 
 		for (size_t j=0; j<n->nIn(); j++)  {
 			Synapsis *s = &(n->synIn(j));
-			s->setDelta(l_rate * d * s->getIn()->getActv());
+			s->setDelta((-l_rate) * d * s->getIn()->getActv());
 		}
 	}
 }
@@ -420,7 +420,7 @@ NeuralNet::NeuralNet (const char *fname) throw() {
  * @throw InvalidXMLException
  */
 void NeuralNet::train (string xmlsrc, NeuralNet::source src = file) throw()  {
-	float out;
+	double out;
 	CMarkup xml;
 
 	if (src == file)
@@ -435,8 +435,8 @@ void NeuralNet::train (string xmlsrc, NeuralNet::source src = file) throw()  {
 
 	if (xml.FindElem("NETWORK"))  {
 		while (xml.FindChildElem("TRAINING"))  {
-			vector<float> input;
-			float output;
+			vector<double> input;
+			double output;
 			bool valid = false;
 
 			xml.IntoElem();
@@ -489,14 +489,14 @@ void NeuralNet::initXML (string& xml)  {
 }
 
 /**
- * @brief Splits a string into a vector of floats, given a delimitator
+ * @brief Splits a string into a vector of doubles, given a delimitator
  * @param delim Delimitator
  * @param str String to be splitted
- * @return Vector of floats containing splitted values
+ * @return Vector of doubles containing splitted values
  */
-vector<float> NeuralNet::split (char delim, string str)  {
+vector<double> NeuralNet::split (char delim, string str)  {
 	char tmp[1024];
-	vector<float> v;
+	vector<double> v;
 	memset (tmp, 0x0, sizeof(tmp));
 
 	for (unsigned int i=0, j=0; i <= str.length(); i++)  {
@@ -525,7 +525,7 @@ vector<float> NeuralNet::split (char delim, string str)  {
  */
 string NeuralNet::XMLFromSet (int id, string set)  {
 	string xml;
-	vector<float> in, out;
+	vector<double> in, out;
 	unsigned int delimPos = -1;
 	char delim=';';
 	char tmp[1024];
diff --git a/src/neuron.cpp b/src/neuron.cpp
index 73de928..8ebc7f0 100644
--- a/src/neuron.cpp
+++ b/src/neuron.cpp
@@ -19,7 +19,7 @@ using namespace neuralpp;
  * @param a Activation function
  * @param d Its derivate
  */
-Neuron::Neuron (float (*a)(float), float (*d)(float))  {
+Neuron::Neuron (double (*a)(double), double (*d)(double))  {
 	actv_f=a;
 	deriv=d;
 }
@@ -27,7 +27,7 @@ Neuron::Neuron (float (*a)(float), float (*d)(float))  {
 /**
  * @brief Alternative constructor, that gets also the synapsis linked to the neuron
  */
-Neuron::Neuron (vector< Synapsis > i, vector< Synapsis > o, float (*a)(float), float(*d)(float))  {
+Neuron::Neuron (vector< Synapsis > i, vector< Synapsis > o, double (*a)(double), double(*d)(double))  {
 	in=i;
 	out=o;
 
@@ -58,12 +58,12 @@ void Neuron::push_out (Synapsis& s)  { out.push_back(s); }
 /**
  * @brief Change the propagation value of the neuron
  */
-void Neuron::setProp (float val)  { prop_val=val; }
+void Neuron::setProp (double val)  { prop_val=val; }
 
 /**
  * @brief Change the activation value of the neuron
  */
-void Neuron::setActv (float val)  { actv_val=actv_f(val); }
+void Neuron::setActv (double val)  { actv_val=actv_f(val); }
 
 /**
  * @return Number of input synapsis
@@ -78,18 +78,18 @@ size_t Neuron::nOut()  { return out.size(); }
 /**
  * @brief It gets the propagation value of the neuron
  */
-float Neuron::getProp()  { return prop_val; }
+double Neuron::getProp()  { return prop_val; }
 
 /**
  * @brief It gets the activation value of the neuron
  */
-float Neuron::getActv()  { return actv_val; }
+double Neuron::getActv()  { return actv_val; }
 
 /**
  * @brief Propagate a neuron's activation value to the connected neurons
  */
-float Neuron::propagate()  {
-	float aux=0;
+double Neuron::propagate()  {
+	double aux=0;
 
 	for (size_t i=0; i<nIn(); i++)
 		aux += (in[i].getWeight() * in[i].getIn()->actv_val);
diff --git a/src/synapsis.cpp b/src/synapsis.cpp
index a2ff47f..89d10e5 100644
--- a/src/synapsis.cpp
+++ b/src/synapsis.cpp
@@ -22,7 +22,7 @@ using namespace neuralpp;
  * @param a Activation function
  * @param d Derivate for activation function
  */
-Synapsis::Synapsis (Neuron* i, Neuron* o, float(*a)(float), float(*d)(float))  {
+Synapsis::Synapsis (Neuron* i, Neuron* o, double(*a)(double), double(*d)(double))  {
 	srand((unsigned) time(NULL));
 
 	delta=0;
@@ -42,7 +42,7 @@ Synapsis::Synapsis (Neuron* i, Neuron* o, float(*a)(float), float(*d)(float))  {
  * @param a Activation function
  * @param d Derivate for activation function
  */
-Synapsis::Synapsis (Neuron* i, Neuron* o, float w, float(*a)(float), float(*d)(float))  {
+Synapsis::Synapsis (Neuron* i, Neuron* o, double w, double(*a)(double), double(*d)(double))  {
 	delta=0;
 	weight=w;
 	in=i;
@@ -65,21 +65,21 @@ Neuron* Synapsis::getOut()  { return out; }
 /**
  * @return Weight of the synapsis
  */
-float Synapsis::getWeight()  { return weight; }
+double Synapsis::getWeight()  { return weight; }
 
 /**
  * @return Delta of the synapsis
  */
-float Synapsis::getDelta()  { return delta; }
+double Synapsis::getDelta()  { return delta; }
 
 /**
  * @brief It sets the weight of the synapsis
  */
-void Synapsis::setWeight(float w)  { weight=w; }
+void Synapsis::setWeight(double w)  { weight=w; }
 
 /**
  * @brief It sets the delta (how much to change the weight after an update) 
  *  of the synapsis
  */
-void Synapsis::setDelta(float d)  { delta=d; }
+void Synapsis::setDelta(double d)  { delta=d; }