how to plot the function
显示 更早的评论
f=0.18x+0.003xy+10
in x y plane
采纳的回答
Follow me, type this out using this example.
Then, you put your equation that you want to plot on the x–y plane.
x = linspace(-60, 60, 1201);
y = -(20*(500 + 9*x))./(3*x);
plot(x, y)
ylim([-6000 6000]), xlabel('x'), ylabel('y')
更多回答（1 个）
Try this:
clear
close all
N = 10 ;
x = -N:0.5:N;
y = x;
[X, Y] = meshgrid(x, y);
f = @(x,y)(0.18*x + 0.003*x.*y + 10) ; % Create function
% Using countouf (x y plane)
tiledlayout(2,1)
nexttile
contourf(X, Y, f(X,Y));
% Using surf (3D) plot)
nexttile
surf(X, Y, f(X,Y))
11 个评论
John D'Errico
2022-7-8
Please don't do obvious homework assignments for students who have made no effort to do them. This teaches the student nothing, except that there will be someone who they can con into doing their homework for them. It hurts the site, because then the same student will then assume it is proper to post their homework, and then they often try to delete their question, once they realize their instructor would not wish them to be posting their homework assignments.
Satyajit Kumar
2022-7-8
Abderrahim. B
2022-7-8
编辑：Abderrahim. B
2022-7-8
@John D'Errico thanks. Will try to not answer this kind of questions.
Abderrahim. B
2022-7-8
@Sam Chak have just known that I have 2 level badge, thanks for that. I am here to help . By the way your answer is not correct.
Torsten
2022-7-8
By the way: Yours is also wrong.
f = @(x,y)(0.18*x + 0.003*x.*y + 10) ; % Create function
instead of
f = @(x,y)(0.18*x + 0.003*x*y + 10) ; % Create function
Abderrahim. B
2022-7-8
@Torsten yes, elementwise multiplication, was a typo. Thanks
Sam Chak
2022-7-8
Thanks for pointing out. My original intent was to simply show @Satyajit Kumar how to plot a certain equation like this,
on the 
plane. Nothing more, nothing less. If fact, I even encouraged him to replace my example with the equation that he wants to plot. If you edit your Answer to fix the small issue on the code as highlighted @Torsten, I will persuade @Satyajit Kumar to accept your Answer. No worries, this is a very small issue.
plane. Nothing more, nothing less. If fact, I even encouraged him to replace my example with the equation that he wants to plot. If you edit your Answer to fix the small issue on the code as highlighted @Torsten, I will persuade @Satyajit Kumar to accept your Answer. No worries, this is a very small issue.Have a nice weekend.
Abderrahim. B
2022-7-8
编辑：Abderrahim. B
2022-7-8
@Sam Chak got your point. In this case your answer is also correct. The small issue was just a typo and I edited my answer already. Enjoy your weekend.
Satyajit Kumar
2022-7-9
Learning MATLAB primarily means trying and testing. That's what we miss in your attempts to understand the language.
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