Azzera filtri
Azzera filtri

Numerical integration using Trapz

8 visualizzazioni (ultimi 30 giorni)
Hi all,
I am trying to calculate a double integral over a rectangular grid using trapz.
The grid is defined as:
[x,z] = meshgrid(xp,zp);
xp and zp are the 1d arrays of x and z coordinates of the grid.
I trying to calculate the function values (F) at the grid nodes as:
F(i,j)=trapz(zp,trapz(xp,g.*f,2));
here,
g is a function of x and z i.e. g(x,z) whereas, f values are already calculated values at each node of the grid i.e. not a function of x and z.
Can someone suggest how may I do it, please.

Risposta accettata

Star Strider
Star Strider il 6 Mag 2021
That should produce one scalar value as ‘F’, so the subscripts are not necessary.
I would do something like this —
F = trapz(zp,trapz(xp,g.*f));
The result of the first trapz call will be a vector, and of the second will be a scalar. So long as ‘g’ and ‘f’ have compatible dimensions, and they match ‘xp’ and ‘zp’ appropriately, that should work.
  6 Commenti
Waseem Akhtar
Waseem Akhtar il 7 Mag 2021
Thank you Star Strider, your first answer was correct.
Star Strider
Star Strider il 7 Mag 2021
As always, my pleasure!

Accedi per commentare.

Più risposte (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by