Does anybody know how the quadv function works in matlab? I am trying to get a plot of the on axis field of a finite solenoid, so the formula (given I didn't make some stupid mistake deriving it, which is beside the point) should be:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]H(z) = \int_{-L/2}^{L/2} \mu_0 \frac{NI}{2L} \frac{R^2}{((z-z')^2 + R^2)^{(3/2)}} dz'[/tex]

So I want it to integrate for every position from 0 to 100mm. The quad integration doesn't work because I have a vector, so I thought I would use quadv with the following mfile.

%function for thin finite solenoid

function Hz = hfield(z)

N = 10; %number of turns

I = 1; %current (amps)

a = 32.5*10.^-3; %radius of coil (m)

d = (0:0.1:100)*10^-3; %axis vector (m)

L = 10*10.^-3; %length of solenoid (m)

m = 1.25663706*10^-6; %magnetic constant

Hz = (m.*N.*I.*a.^2)./((2*L.*(a.^2+(d-z).^2).^(3/2))); %field to integrate

But when I try the function call

quadv(@Hfield, -5, 5);

Matlab says that there is a problem in the subtraction of matrix dimensions, which means that it doesn't like subtracting each array array element by the variable of integration z. I figured that it would go through the integration for each element of d, and integrate z, but apparently not? Does anybody know how to get it to do what I want it to do, which is integrate each time with with the corresponding element from the distance vector? Maybe I have to make my limits arrays too.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Matlab quadv

Loading...

Similar Threads for Matlab quadv |
---|

MATLAB MATLAB: forces acting on an object |

MATLAB Matlab histogram |

MATLAB Sovling Bernoulli's differential equation in matlab? |

MATLAB Matlab-like software |

MATLAB Matlab data into bins |

**Physics Forums | Science Articles, Homework Help, Discussion**