2D function with surf and surfc

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Andre589
Andre589 2016-9-24
评论： Star Strider 2016-9-24
Hello guys, I am kinda new to MatLab and I have a question for this exercise. I have to plot this function f(x,y)=cos(x)*sin(y). x,y Element of [-pi,pi] with 0.1 steps.
So I have to use surf and surfc for this and do a subplot. But I really have no clue how to start at this can someone help me I would be very grateful.
We got a hint for this exercise we should use the command meshgrid.

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回答（1 个）

Star Strider
Star Strider 2016-9-24
You need to characterise your function as a vectorised anonymous function:
f = @(x,y) cos(x).*sin(y);
define ‘x’ and ‘y’ using the colon ‘:’ operator, and the meshgrid function to produce the grids you will need to do the calculations and the plot.
Helpful parts of the documentation are Array vs. Matrix Operations, Function Basics, and colon.
  2 个评论
Andre589
Andre589 2016-9-24
So at the moment I have this
[X,Y] = meshgrid(-pi:.1:pi);
Z = cos(x).*sin(y);
surf(X,Y,Z)
But its not working right now. Can you tell me what did I wrong?
Star Strider
Star Strider 2016-9-24
Yes.
MATLAB is case-sensitive, so ‘x’ is not the same as ‘X’. You need to calculate ‘Z’ using ‘X’ and ‘Y’.
Everything else looks correct. With that change, you should get an interesting-looking plot.

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