How to save these values in a matrix

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Ahmed Hassaan 2012-2-28

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hello , example : clc;clear all;close all; a=variable;b=variable2; for i=1:0.1:10 for j=1:0.1:10 ax=i-a; ay=j-b; z=[ax ay]; end end this is a very simple example but the point is i want to save all the results of ax and ay in the Z in the workspace as a matrix not the last value of ax and ay , Thanks for your help :)

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Honglei Chen 2012-2-28

Please format your question

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

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Answer 1

Honglei Chen 2012-2-28

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在 MATLAB Online 中打开

Use a for loop and preallocate z, i.e., add

z = zeros(91*91,2)

at front and then replace the assignment to z with

clc;clear all;close all; a=1;b=2; 
z = zeros(91*91,2);
i = 1:0.1:10;
j = 1:0.1:10;
for m = 1:numel(i) 
  for n = 1:numel(j)
      ax=i(m)-a; 
      ay=j(n)-b; 
      z((m-1)*numel(i)+n,:) = [ax ay];
  end
end

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Ahmed Hassaan 2012-2-28

thx for ur attention but it gives me the same error ,,anyway this is not the code im using its just an example ,

i just want to get z in the workspace as a table containing different values of variables in the for loop ,,

and this is the code :

close all;clear all;clc

r=1;L=3;N=3;RN=10;

k=-L/2:1.732*r:L/2;

A=mean(k);

for k=-L/2:1.732*r:L/2

ax=k-A;

ay=0;

r1=sqrt(3)*r/2;r2=(r/2);x=[ax ax+r1 ax+r1 ax ax-r1 ax-r1];y=[ay+r ay+r2 ay-r2 ay-r ay-r2 ay+r2];

fill(x,y,'g')

grid on ;

hold on

plot(ax,ay,'bo')

g=[ax ay]

end

I just want g to be contained the different values of ax & ay every loop ..

and thanks again :)

Honglei Chen 2012-2-28

It's because of the precision, you can either round it, or specify all possible i's and j's and then iterate the number of elements. See the updated example.

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