Numerical integration using Trapz
26 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Waseem Akhtar
am 6 Mai 2021
Kommentiert: Star Strider
am 7 Mai 2021
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.
0 Kommentare
Akzeptierte Antwort
Star Strider
am 6 Mai 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 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Numerical Integration and Differentiation finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!