MATLAB: In an assignment A(:) = B, the number of elements in A and B must be the same.

for loop

My code is:
pvals = 10:1:15;
nump = length(pvals);
for pidx = 1 : nump
    p=pvals(pidx);
    [x(pidx),y(pidx)]=solve('9*x(pidx)+8*y(pidx)=p','13*x(pidx)+14*y(pidx)=p+2','x(pidx)','y(pidx)');
end
plot(pvals,x)
The error is:
In an assignment  A(:) = B, the number of elements in A and B must be the same.
Any help is appreciated! Thanks!

Best Answer

My version of the Symbolic Math Toolbox doesn’t like quoted strings, so I had to change your code a bit.
Try this: 
syms p x y 
pvals = 10:1:15;
nump = length(pvals);
for pidx = 1 : nump
    p=pvals(pidx);
    [xs(pidx),ys(pidx)]=solve([9*x+8*y==p, 13*x+14*y==p+2], [x y]);
end
plot(pvals,xs)
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