How to convert C++ code into Matlab. How to write the below given part of code into matlab

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vandana
vandana on 18 Aug 2015
Commented: Guillaume on 18 Aug 2015
double logistic(double x)
{
if(x > 100.0) x = 1.0;
else if (x < -100.0) x = 0.0;
else x = 1.0/(1.0+exp(-x));
return x;
}
void ComputeFeedForwardSignals(double* MAT_INOUT,double* V_IN,double* V_OUT, double* V_BIAS,int size1,int size2,int layer)
{
int row,col;
for(row=0;row < size2; row++)
{
V_OUT[row]=0.0;
for(col=0;col<size1;col++)V_OUT[row]+=(*(MAT_INOUT+(row*size1)+col)*V_IN[col]);
V_OUT[row]+=V_BIAS[row];
if(layer==0) V_OUT[row] = tanh(V_OUT[row]);
if(layer==1) V_OUT[row] = logistic(V_OUT[row]);
}
}

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Accepted Answer

Titus Edelhofer
Titus Edelhofer on 18 Aug 2015
Hi Vandana,
that should be straight forward:
function y = logistic(x)
y = zeros(size(x));
y(x>100) = 1.0;
idx = x>=-100 & x<=100;
y(idx) = 1.0./(1.0+exp(-x));
and the main function
function V_OUT = ComputeFeedForwardSignals(MAT, V_IN, V_BIAS, layer)
V_OUT = MAT * V_IN + V_BIAS;
switch layer
case 0
V_OUT = tanh(V_OUT);
case 1
V_OUT = logistic(V_OUT);
otherwise
error('Unknown value for layer.')
end
Titus

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