how to plot sine and cosine waves in one graph ?

2012 9 28
5 个回答
回答已采纳
更新时间：2022 4 7
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1 个投票

used for academic use

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Write a program to plot the function sin(x) between 0≤x≤4π.
Walter Roberson
Walter Roberson 2022-4-7
Ran in:
Ran in:
@Krishan Guiya
syms x b
a = randn()
a = -1.0804
f = cos(a*x + b);
fsurf(f, [-10 10 -2*pi 2*pi])
xlabel('x'); ylabel('b')

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 采纳的回答

Wayne King
Wayne King 2012-9-28

2 个投票

It sounds like the OP wants this in one graph (not subplotted)
t = 0:0.01:(2*pi);
x = cos(t);
y = sin(t);
plot(t,x,'k'); hold on;
plot(t,y,'r-.');
axis([0 2*pi -1.5 1.5])
legend('cos(t)','sin(t)','Location','NorthEast')

更多回答（4 个）

0 个投票

a = 10;
t = 0 : 0.01 : 10;
A = a*sin(t);
subplot(121),plot(t,A);
B = a*cos(t);
subplot(122),plot(t,B);

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Lee Johnson
Lee Johnson 2017-3-2
Thanks. What is subplot 121 and 122?
Stephen23
Stephen23 2017-3-2
编辑：Stephen23 2017-3-2
@Lee Johnson: syntax not supported by MATLAB. Looks like MatPlotLib to me.
The MATLAB subplot documentation gives this syntax:
subplot(m,n,p)
and explains what m, n, and p are. There is of course no point in simply copying this info here when you can read in the documentation (see link).
Walter Roberson
Walter Roberson 2021-2-1
subplot 121 is archaic, no longer documented, but still works. It is interpreted as subplot(1, 2, 1)

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Abdullah Rajput
Abdullah Rajput 2020-8-19

0 个投票

close all; clear all; clc;
t=[0:0.5:180]
x=sind(t);
plot(t,x),hold on
y=cosd(t);
plot(t,y)
legend('Sine wave','Cos wave')

0 个投票

hold on not needed
x=0:0.1:2*pi;
plot(x,sin(x),"b",x,cos(x),"g");
"b" and "g" - color

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Walter Roberson
Walter Roberson 2021-3-12
This is correct.
For old enough MATLAB (before R2017a) replace the "b" by 'b' and "g" by 'g'
Walter Roberson, thanks for the clarification about older versions! I did not know that.
Walter Roberson
Walter Roberson 2021-3-12
I would not normally have mentioned a backwards compatibility like that now that we are 4 years on, but I suspect this question is getting read by people who are using old versions of MATLAB. (We are getting a rush of people using MATLAB from 2013 and 2015.)
You are absolutely right. This is very useful information, because not everyone has the latest versions, they are not required for simple tasks. Correct syntax - 50% success.

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