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Forward, backward and central differences

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HoboHarry
HoboHarry 2018-10-21
回答： Image Analyst 2018-10-21
trying to calculate the forward, backward and central difference for tanx+cosy with a step of 0.1 and x and y domains between 1 and 5.
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Image Analyst
Image Analyst 2018-10-21
What is your definition of those 3 differences?
HoboHarry
HoboHarry 2018-10-21
i'm not even sure where to start. i know for just calculating one for tanx by itself uses (f(x+h)-f(x))/h; for fwd difference where h is the step. but not sure where to go with two variables

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Image Analyst
Image Analyst 2018-10-21
Try conv():
kernel = [1, -1];
output = conv(signal, kernel);
kernel = [-1, 1];
output = conv(signal, kernel);
kernel = [1, -2, 1];
output = conv(signal, kernel);
See if that gives you what you want. Do you have a signal and the desired output so we can check it?

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