How do I read a large list of X,Y co-ordinates from Notepad and plot a graph in Matlab ?

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Harshal
Harshal 2014-4-17
评论： Stelios Fanourakis 2018-5-2
Hello all, I have a large list of points (about 16,000) in Notepad with X and Y co-ordinates. I want to read the list and plot different graphs on the same X and Y axes (i.e. the X axis is the same). How can I read the list in Matlab and plot the graphs based, with different colours ?
Thank You

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-4-17
data=dlmread('yourfile.txt');
x=data(:,1);
y=data(:,2);
plot(x,y)
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Stelios Fanourakis
Stelios Fanourakis 2018-5-2
@Azzi That's nice. But what happens if txt files contains fractional numbers, negative integers or zeros. I cannot use I(x,y), where I is my image to imshow my image with x,y values as coordinators

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