I am trying to get a numerical gradient with three variables, but I keep getting Error using gradient (line 49) Too many output arguments.

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Ty Joslin 2017-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/332378-i-am-trying-to-get-a-numerical-gradient-with-three-variables-but-i-keep-getting-error-using-gradien

回答： Sangeetha Jayaprakash 2017-4-4

I am trying to get a numerical gradient with three variables, but I keep getting Error using gradient (line 49) Too many output arguments. This is what I have:

clc, clear x = -3:0.2:3; y = x'; z = x'; f = cos(x.*y.*z.^2); % I even put in a visual surf(x,y,f) xlabel('x') ylabel('y') zlabel('z') % End of code for a visual [fx,fy,fz] = gradient(f,0.2); x0 = pi; y0 = 1/4; z0 = -1; t = (x == x0) & (y == y0) & (z == z0); indt = find(t); f_grad = [fx(indt) fy(indt) fz(indt)]

Any and all help is appreciated. Thank you!