I have a matrix of 3 variables and want to calculate its Constants value so what should be the CALLING Equation in Custom type in CFTOOL???

Question

chetan meena 2016-7-4

编辑： José-Luis 2016-7-4

Have 4 variables namely a,b,c and d (each having 50 values)

d=f(a,b,c) I made a matrix called X=[a b c] and Y=[d]

Then now using CFTOOL Entered xdata=X and ydata=Y

NOW in Custom equation what should I call as I want to relate it as Y=p.*X(column a)+q.*X(column b)+r.*X(column c)

p(with only column a) and q(with only column b) and r(with only column a)

and find out p ,q ,r

I have tried Y=p.*X(:,1)+q.*X(:,2)+r.*X(:,3) but it didn't work

what is the equation I should Enter in Custom Equation Block

Answer 1

José-Luis 2016-7-4

You might be going overkill. You could obtain your answer in a much less convoluted way:

 a = rand(50,1);
 b = rand(50,1);
 c = rand(50,1);
 d = rand(50,1);
 your_result = [a, b, c] \ d;

chetan meena 2016-7-4

编辑：chetan meena 2016-7-4

I do not want to do by this method because I want all the values LIKE R-SQUARED SSE RMSE and confidence percent

José-Luis 2016-7-4

编辑：José-Luis 2016-7-4

Then you won't be able to use cftool since it takes at most a function of two variables and you have three.

Generalized linear models however, might give you what you are looking for.