How to plot the dervative of a curve

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ayat
ayat 2013-2-15
Hi, I am very new to Matlab so apologies in advance! I have two columns of numbers which I have used for plotting a simple x-y curve. Now I need to have the derivate of this curve. So it would be like dx/dy for Y axis.
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Jan
Jan 2013-2-15
When you post the code (or an example code) for "I have two columns of numbers", it would be much easier to create an answer. Obviously Azzi fails to guess the names of the variables you use, and you fail to transfer his suggestion to you real application.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-2-15
For example
X=0:0.1:10 % Your x-axis
Y=sin(X) % Your strain signal
dY=diff(Y)./diff(X)
plot(X,Y) % Your original signal
hold on
plot(X(2:end),dY,'r') %Your derivative signal
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Image Analyst
Image Analyst 2013-2-15
编辑：Image Analyst 2013-2-15
Let's quit wasting time. ayat, upload your data somewhere - your favorite web site. Tell us the URL, and the code you used to read in the data file, so we can give you code that uses your exact data. Azzi's example was correct - you obviously changed something in it. You probably have a huge derivative because at some point(s) your curve turns almost vertical.
ayat
ayat 2013-2-16
ok, here is the basic x-y I have:
http://www.mediafire.com/?2cqugy3ja1vn5pn
So I need the change in the slope of this data plotted as a new curve. If you could give me the code that would do that I would really be grateful!

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