MATLAB Answers


How can I write a spesific math function, can anyone help?

Asked by rania
on 23 Sep 2013

I want the program to calculate dV(r)/dLnr= V(r)dN(r)/dLnr, where dN/dr = number distribution and I have the "N" in ".txt" files.. How can I write that code? (I know how to define the pathname, in order to open the folder with the txt files).How can I define the "ln" and the "d/dr"? and then I must plot dV(r)/dLnr= V(r)dN(r)/dLnr -Yaxis, radius-Xaxis, x-axis has just numbers from 0.0 to 18.0 um. I wasn't very clear, was I? I'm sorry, but I m realy confused.:( if anyone can give any Ideas, it woyld be very helpful.



No products are associated with this question.

2 Answers

Answer by rania
on 23 Sep 2013

this is what I want to get in the end


Answer by Chocolate Warrior on 23 Sep 2013

Use Differentiation function if you are looking for that. That is what i could infer from your question.

  1 Comment

If the N are in a text file, my interpretation would be that numeric solutions are required, such as by using gradient()

Join the 15-year community celebration.

Play games and win prizes!

Learn more
Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

MATLAB Academy

New to MATLAB?

Learn MATLAB today!