Plotting multiple functions in the same graph

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Moslem Uddin
Moslem Uddin 2020-4-14
评论： Walter Roberson 2020-4-22
I want to plot two different functions in a same graph for different values of a parameter.
I tried the following code:
clc
clear all
syms y
t=[1 5];
for i=1:length(t)
U=exp(-y)*sin(t(i));
fplot(U,y,[0,5]); hold on;
U1=exp(-y)*cos(t(i));
fplot(U1,y,[0,5]); hold on;
end
Is that alright?

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Walter Roberson
Walter Roberson 2020-4-14
syms y
t=[1 5];
for i=1:length(t)
U=exp(-y)*sin(t(i));
fplot(U,[0,5]); hold on;
U1=exp(-y)*cos(t(i));
fplot(U1,[0,5]);
end
hold off
Or you could
syms y
t=[1 5];
for i=1:length(t)
U=exp(-y)*sin(t(i));
U1=exp(-y)*cos(t(i));
fplot([U,U1],[0,5]);
hold on
end
hold off
  5 个评论
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Moslem Uddin
Moslem Uddin 2020-4-21
编辑：Moslem Uddin 2020-4-22
Is there any other way performing this plotting without using for loop? For loop seems to reducing Matlab's performance. @walter roberson
Walter Roberson
Walter Roberson 2020-4-22
If your t is fixed length, you can "unroll the loop", just putting all of the instructions in a row:
syms y
t=[1 5];
U=exp(-y)*sin(t(1));
fplot(U,[0,2]); hold on;
U1=exp(-y)*cos(t(1));
fplot(U1,[2,5]);
U=exp(-y)*sin(t(2));
fplot(U,[0,2]);
U1=exp(-y)*cos(t(2));
fplot(U1,[2,5]);
hold off
I think you will find that the for loop was contributing negligible time compared to the time required to do the fplot().

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