Need help with subplot

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Ping
Ping 2012-10-15
Instructions:
Create a MATLAB function called plot05 that generates a 3x1 matrix of subplots, where yi = sin(x*i*π) appears in the ith subplot and i = 1, 2, 3. Define the length of the guitar string to be an array of 100 equally spaced values over the interval [0, 1]. Plot the first harmonic in subplot 1 and set the linewidth property to 1. Plot the second harmonic in subplot 2 and set the linewidth property to 2. And plot the third harmonic in subplot 3 and set the linewidth property to 3.
so i need to create a subplot that looks like this:
http://i1308.photobucket.com/albums/s617/pingchu93/graph4_zps3c103949.jpg
but my graph is way off--what is wrong with my code?
function [y] = plot05(x,i)
x= 0:.01:1
i= [ 1 2 3]
y = sin (x.' * i .* pi)
hold on
x = 0:.01:1;
subplot(3,3,1);
linewidth = 1;
plot(x,y,'LineWidth',linewidth)
hold off
hold on
x = 0:0.01:1;
subplot(3,3,4);
linewidth = 2;
plot(x,y,'LineWidth',linewidth)
hold off
hold on
x = 0:0.01:1;
subplot(3,3,7);
linewidth = 3;
plot(x,y,'LineWidth',linewidth)
hold off

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采纳的回答

Matt Fig
Matt Fig 2012-10-15
编辑：Matt Fig 2012-10-15
x = 0:.01:pi;
subplot(3,1,1)
plot(x,sin(x))
subplot(3,1,2)
plot(x,sin(x*3))
subplot(3,1,3)
plot(x,sin(x*6))
Think of the arguments to SUBPLOT as setting up a grid. You want a 3-by-1 grid, so the first two arguments to subplot should be 3,1. The third argument is which of the axes on that grid you want to create. So when you say subplot(3,1,3) you are asking subplot to create the third axes on a 3-by-1 grid. This lets you do neat things like this:
x = 0:.01:pi;
subplot(3,1,1)
plot(x,sin(x))
subplot(3,1,2)
plot(x,sin(x*pi))
subplot(3,2,5)
plot(x,sin(x*2*pi))
subplot(3,2,6)
plot(x,sin(x*3*pi))
  1 个评论
Ping
Ping 2012-10-15
thanks! The lines are a bit different than from the graph but i think I can figure it out from here.

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更多回答（2 个）

Wayne King
Wayne King 2012-10-15
编辑：Wayne King 2012-10-15
Because you want
subplot(3,1,1)
subplot(3,1,2)
and not
subplot(3,3, ...)
subplot(3,3, ) means 3 rows and 3 columns, you just want 3 rows and 1 column
Image Analyst
Image Analyst 2012-10-15
Try this:
x= 0:.01:1
i= [ 1 2 3]
y = sin (x.' * i .* pi)
hold on
x = 0:.01:1;
subplot(3,3,1:3);
linewidth = 1;
plot(x,y,'LineWidth',linewidth)
x = 0:0.01:1;
subplot(3,3,4:6);
linewidth = 2;
plot(x,y,'LineWidth',linewidth)
x = 0:0.01:1;
subplot(3,3,7:9);
linewidth = 3;
plot(x,y,'LineWidth',linewidth)
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
  3 个评论
显示 1更早的评论
Ping
Ping 2012-10-15
thanks! I got 3 different subplots just like in the picture. But how do I get 3 separate lines? My 3 graphs all have 3 lines on each plot instead of 1 line per plot.
Image Analyst
Image Analyst 2012-10-15
make i 1, 2, or 3, not an array [1 2 3].

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