Parse error at ')'when plotting surface plot
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Hey, I'm trying to plot the surface plot z=(x^2-ycos(x))/sqrt(x^2+y^2)
Everytime I try to run the program though, it keeps coming up with the error: "parse error at ')': usage might be invalid Matlab syntax" after the cos(x.) in the equation. Any help would be much apreciated :)
x=-5:.1:5;y=x;[x,y]=meshgrid(x,y);
z = (x.^2-y.*cos(x.))/sqrt(x.^2+y.^2);
surfc(z)
xlabel('x axis')
ylabel('y axis')
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Walter Roberson
2019-3-3
编辑：Walter Roberson
2019-3-3
0 个投票
In MATLAB, periods in source code must be in one of the following contexts:
- in a comment
- in a single-quoted string
- in a double-quoted string (R2017a and later)
- proceeded by a numeric digit, such as 35.
- followed by a numeric digit, such as .35
- followed immediately by * or ^ or / such as 3.*5 or 3.^5 or 3./5
- between two variable names, or two parts of a package name, indicating structure access or property access or method invocation, such as MyStruct.field7 or matlab.lang.makevalidname
- after a variable name but before a ( indicating dynamic field access, such as MyStruct.(fn{3})
In your expression cos(x.) this is not any of the cases.
MATLAB does not permit abbreviating floating point 0 as just plain . requiring instead 0 or 0. or .0 . And if it did accept plain . as 0, it would still be an error to have written cos(x 0) without an operator between the x and the zero.
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