Plus sign is adding error to code?? Help Please??

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S.R.
S.R. 2017-2-20
回答： Walter Roberson 2017-2-20
Here is the code i am using. I was able to fix it however, now its highlighting the plus sign as an error. Can anybody help?? The original function is:
F(x,y)=xy-lnx-y^2/2+C
%
[X,Y] = meshgrid(-3:.01:3, -4:.01:4);
contour(X, Y, ((X.*Y. + ln(X.)+((Y.^2)./2))))
hold on

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回答（2 个）

KSSV
KSSV 2017-2-20
编辑：KSSV 2017-2-20
[X,Y] = meshgrid(-3:.01:3, -4:.01:4);
Z = ((X.*Y + log(X)+((Y.^2)./2))) ; % Z is complex check
contour(X, Y,real(Z) )
There is .+, only +.
Walter Roberson
Walter Roberson 2017-2-20
You have
Y. +
notice the dot before the space before the +

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