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how to find the local Slope of a curve in each point

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how to calculate the local slope degree of this curve in its point having the x and y values of the curve:
I tried to do it with the following :
slope = diff(y) ./ diff(x);
or :
slopeY = (y(2:end) + y(1:end-1))/2;
but my results doesnt seem to be correct. Thank you.
  2 Comments
Adam
Adam on 24 Sep 2014
In what way do the results not seem correct? Do you have manually calculated results that differ?
Star Strider
Star Strider on 24 Sep 2014
I would use gradient rather than diff, since the output vector is the same length as the input vector.

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Answers (1)

the cyclist
the cyclist on 24 Sep 2014
One possibility is to use the movingslope function from the File Exchange.

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