Display the calculation result

Dear :

I have 4(declared for cont) datas of weight,my code is following:

 clc
 clear all

 weight=[1 1 1 1;2 2 2 2;3 3 3 3;4 4 4 4];
 ax=[1 2 3 4;1 2 3 4;1 2 3 4;1 2 3 4];
 Beta=[0 0 0 0];

 cont=length(weight);

 for cont_I=1:cont    

    Etotalx=zeros(cont,cont_I);
    for g=1:4
        Etotalx(:,cont_I)=Etotalx(:,cont_I)+weight(cont_I,g).*ax(:,g)*exp(1j*Beta(g));
    end

 end

But the display result only has the last result(the 4th data),others(the former ones) are 0.

The result like this picture:

This is my problem,need everyone's instruction and advice,thank for first.

Answer 1

[Shrestha Kumar]

Hi, You are declaring a zero matrix each time inside the loop i.e for the first iteration you declare a 4*1 zero matrix and then update the first column, in the second iteration you declare a 4*2 zero matrix and update only the second column and the first column remains zero and so on. The solution for the problem is to declare a 4*4(i.e cont * cont) zero matrix outside the loop and then update the columns.

Etotalx = zeros(cont,cont); for cont_I = 1:cont for g=1:4 ....

[Zoe Lin]

Dear Shrestha Kumar:

Thanks a lot,thank you for your big help,thanks~