How to remove this error Improper assignment with rectangular empty matrix.

While running this file I m getting an error as ??? Improper assignment with rectangular empty matrix. I dont know what wrong I m doing? va is vector and d_va may have some nan value also.

b=floor(100-100*min(sp)); d_va=zeros(1,b);

for a=1:b

    m=(100-a)/100;
    xa=find(m-0.001 <= sp & sp <= m+0.001, 1, 'last' );
    m2=m-(0.05*m/100);
    xb =find(m2-0.001<=sp & sp<=m2+0.001, 1, 'last' );
    va1=va(xa);
    va2=va(xb);
    d_va(a)=(va1-va2)*100/va1; % This line shows an error,??? Improper assignment with rectangular empty matrix.
end

end

[Andrew Newell]

It is easier to diagnose your code if you provide a complete working example (with values for the variables b, sp, etc.)

Answer 1

[Andrew Newell]

I can't reproduce your exact error message, but it is probably occurring because either va or vb are empty (there weren't any values of sp in the correct range). What you do depends on whether this is an error or it is o.k. If the latter, you could try something like this:

   dva = zeros(b,1); % You should initialize dva
...
    if any(va1) & val~=0 & any(va2)
        dva(a)=(va1-va2)*100/va1;
    end

[Amit]

if I am using in my script 2nd last line dv so I m nt getting any error.

While using dv(a), I am getting the mentioned error.

[Tom]

you mentioned 'dv(a)', whereas in the code it is 'dva(a)'- have you got variables called 'dv' and 'dva' ?

[Amit]

yeah I put the dv =zeros(1,b);

dva=zeros(1,b)