two functions with descriptions in one graph

Question

danielle sisserman 2020-11-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/666763-two-functions-with-descriptions-in-one-graph

回答： Walter Roberson 2020-11-28

for this code:

% approximating f
plot(X_in.', U.');
xlabel('x');
ylabel('approximate f(x)');
legend_strs = compose('Approximate f with h=%.2d', h);
legend(legend_strs);

I get the followin graph (for two different axis steps h = [0.2, 0.025]):

What I want is to add another function to the same graph (true function f) and to add a description of the line in the above right section saying "true function f".

say that f = cos(2x)

how can I do this?

Thank you.

2 个评论
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VBBV 2020-11-28

What is the equation of true function f ?

danielle sisserman 2020-11-28

f = cos(2x)

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Answer 1

Walter Roberson 2020-11-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/666763-two-functions-with-descriptions-in-one-graph#answer_558793

在 MATLAB Online 中打开

f = @(x) cos(2*x);
plot(X_in.', U.', X_in.', f(X_in.'));
xlabel('x');
ylabel('approximate f(x)');
legend_strs = [compose('Approximate f with h=%.2d', h), "true function f"];
legend(legend_strs);