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

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.

[Adam]

In what way do the results not seem correct? Do you have manually calculated results that differ?

[Star Strider]

I would use gradient rather than diff, since the output vector is the same length as the input vector.

Answer 1

[the cyclist]

One possibility is to use the movingslope function from the File Exchange.