How do I produce a graph of the slope of a group of data points?

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I am currently working with a set of historical price points, and I am looking to graph the slope of the changes over time. The data, however, is too erratic to create an effective best fit curve. I am fairly unfamiliar with Matlab. Is there a way to do this effectively?
  11 comentarios
José-Luis
José-Luis el 12 de Jun. de 2014
What is the command you are using?
Mark
Mark el 12 de Jun. de 2014
I originally graphed by using:
[num,txt,raw]=xlsread('Metal Data.xlsx') x = num(1:57,1); y = num(1:57,2); plot(x,y)
That gave me the base plow. I then tried to input the line that you gave me:
plot(diff(x,y));
but it gave me the aforementioned error.

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Respuesta aceptada

José-Luis
José-Luis el 12 de Jun. de 2014
plot(diff(y));
Please read the documentation to see how diff() works.
Please accept an answer when your problem has been solved.
  2 comentarios
Mark
Mark el 12 de Jun. de 2014
Thank you so much for your help, my boss likes your answer!
José-Luis
José-Luis el 12 de Jun. de 2014
Editada: José-Luis el 12 de Jun. de 2014
My pleasure.
Tell your boss he can give me a job if he wants to... ;)

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