I face the error of "In an assignment A(I) = B, the number of elements in B and I must be the same" when i want to create a loop a matrix. my simple short code given below, plz help me?

Question

Mehedi 2014-6-3

评论： Mahdi 2014-6-4

clc clear x1=5; x2=3; x3=2; for i=1:3 if i==1 x1=6; elseif i==2 x1=7; elseif i==3 x1=8; end p(i)=[x1-x2 x3-x2; x2-x3 x1-x3] end

Answer 1

Mahdi 2014-6-3

p(i) is one element, but you are trying to tell it to store multiple values, one of the following would fix your problem (Just replace it):

p(i,:)=[x1-x2 x3-x2; x2-x3 x1-x3]

or

p(:,i)=[x1-x2 x3-x2; x2-x3 x1-x3]

Mehedi 2014-6-4

Now i face another error of "Subscripted assignment dimension mismatch." plz, help me out

Mahdi 2014-6-4

This is a quick non-efficient fix to it.

clc 
clear 
p=[];
x1=5; x2=3; x3=2; 
for i=1:3 
if i==1 
x1=6; 
elseif i==2 
x1=7; 
elseif i==3 
x1=8; 
end 
p=[p;x1-x2 x3-x2; x2-x3 x1-x3]
end