MATLAB: Sigmoid function value for parameter a and b

sigmoid

Please can someone help me with sigmoid function. Please can anyone tell me what values i should give for a and b so that i get for

 y0=sigmf(0,[a b]) % y0 value less than 0.5

and for

 y1=sigmf(1,[a b]) % y1 value greater than 0.5

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According to my calculations you have to pick 0<b<1 and a>0.

E.g. b=1/2 and a=1

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MATLAB: Could anyone help me to solve the issue

This removes elements until your matrix is no longer valid according to your rule. It is very slow for bigger matrices, but it is guaranteed to work. Look up "bubble sort" if you want to understand how it works.

A=rand(4,8);
isValidMatrix=@(x) all(any(x,1)) && all(any(x,2));
B=A;
%use a structure similar to the 'bubble sort' algorithm
for idx1=1:numel(B)
    for idx2=idx1:numel(B)
        if B(idx2)==0,continue,end
        B_temp=B;
        B_temp(idx2)=0;
        if isValidMatrix(B_temp)
            B=B_temp;
        end
    end
end
disp(B)

MATLAB: Double sigmoid fit

Here is an example of how you could use cfittool to create a sigmoid fit. First, enter these commands in the Command Window.

x = -5:.05:5;
y = tanh(x);
cfittool

In the Curve Fitting Tool, do the following:

Click on the Data... button and import x and y.
Click on Fitting... and then New fit.
Under Type of fit, choose CustomEquations.
In the New Custom Equation window, click on GeneralEquations.
In the Equation: line after the = sign, type in a*exp(-b*x)+c, and click OK.
Finally, click Apply to see a nicefit.

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Related Solutions

MATLAB: Could anyone help me to solve the issue

MATLAB: Double sigmoid fit

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