Plotting results of three different data sets on same Plot

Question

Ben Brooke 2012-4-13

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评论： Martin Llorens 2022-11-3

Hi,

I would like to compare the velocity profiles of three different data sets, contained within three different folders. How would I go about writing the code for a function to import the three data sets and plot them all on the same graph so that they can be compared with one another. I would like to be able to change the name of the files to be imported in the code so it can reused for different examples.

I imagine this should be fairly simple, however I'm still very new to Matlab so getting a bit stuck.

Thanks

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Answer 1

laurie 2012-4-13

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How about:

load file1.mat
data1=data;
load file2.mat
data2=data
hold all
plot(data1)
plot(data2)

data1 and data2 must be the same length though I think.

About the different folders: I think if you add all the folders to the path (manually?) it should work fine.

Cheers

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Ben Brooke 2012-4-13

Thanks. I managed to make some alterations but used your basis. Cheers!

laurie 2012-4-13

thanks :) i am glad i can both help and learn new things about matlab

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Answer 2

Vaibhav 2012-4-13

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The code above would work. Another alternative is to

plot(x,y1,x,y2,x,y3)

If x is not same for all 3 sets, then

plot(x1,y1,x2,y2,x3,y3)

But x1,x2,x3 must be the same length.

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Martin Llorens 2022-11-3

But if i want to plot also a tendency line, how i would do it?

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Answer 3

Matt Kindig 2012-4-13

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Depending on the format of the data sets, there are a variety of functions available to import the data. Look at the following to get you started (these are references to topics in Matlab help):

doc load
doc importdata
doc dlmread
doc textscan

To plot data:

 doc plot
 doc hold

To change the names of the files, I would probably have one of the function inputs be a cell array with the filenames, and have a for loop in the function to iterate through each data set and do the plotting.