Slope of experimental data

Hello, everyone. I need a help. Thank you in advance. How can I determine the slope of experimental data.

I have this data:

x = [ log(0.12) log(0.09) log(0.06) log(0.03) log(0.015)];

y1 = [ log(313700) log(112100) log(62840) log(4811) log(511.2)];

Thanks for help!

Best regards

[Alex Mcaulley]

See this polyfit

Answer 1

[Star Strider]

To get the instantaneous slope of your data:

dydx = gradient(y1) ./ gradient(x);

then to plot it:

plot(x, dydx)

The gradient function produces output the same size as the input. For vectors, this is the approximate numerical derivative.