MATLAB: Is multiplying a matrix or a constant with another constant and multiplying a const. with a variable which stores a constant different

getting nanloop probmultiplication of matrix with constant

Respected Sirs, I have a loop running about 1000 times.I am using an equation like

 while...
   for i=1:3
     x(i) = a(i) + a(i)*(b(:,i)).^1.2
   end
 end

and i'm getting some output, BUT when i use this form

b=1.2;
while...
 for i=1:3
   x(i) = a(i) + a(i)*(b(:,i)).^b
 end
end

i get output as [NaN NaN]

why is it happening?? please help!!

Best Answer

Here are some links on debugging in Matlab

BTW: b=1.2; overwrites the array b(:,i)

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MATLAB: Concatenation in a loop

For row wise concatenation:

Here, matrix 'c' is being concatenated to matrix 'a' row wise, number of columns being constant in this case.

a = [];
c = [1 2;3 4];
for i = 1:5
    c = [1*i 2*i;3*i 4*i];
    a = [a;c];   % For row wise concatenation
end

For column wise concatenation:

Here matrix 'c' is being concatenated to matrix 'a' column wise, number of rows being constant in this case.

a = [];
c = [1 2;3 4];
for i = 1:5
    c = [1*i 2*i;3*i 4*i];
    a = [a c];  % For column wise concatenation
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Hope this helps

MATLAB: Decision tree const. prob.

Depends on what you mean by "code of the tree".

If you want to find classregtree code in your MATLAB install, type 'which classregtree'.

If you want to see pseudo-code for the tree, just display the tree in your command window.

If you want to convert this pseudo-code into a MATLAB script, you'd have to do it yourself. You could start by looking at the DISP method of classregtree (type 'which classregtree/disp'). It's the method that produces the pseudo-code you see in the command window.

Best Answer

Related Solutions

MATLAB: Concatenation in a loop

MATLAB: Decision tree const. prob.

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