Integration Problem

Hi there,

Here is the simplified version of what I am trying.

% syms x y
% L=5;
% first = @(x,y)exp(abs(x-y).*(-1./5));
% first = 1/exp(abs(x - y)/5);
% intFirst = int(first,y,0,L);

% throws Warning: Explicit integral could not be found.

I tried uring QUAD, QUADV, QUADGK but I could not make it work.

My ultimate goal is to evaluate:

int(int(first,y,0,L),x,0,L);

... and I am stuck on fist integral :(

Answer 1

[Matt Fig]

Don't use symbolic variables for numerical problems. I assume you want a numeric answer because you are using numeric routines like QUAD, QUADV, and QUADGK.

L=5;
f = @(x,y)exp(abs(x-y).*(-1./5));
integ = dblquad(f,0,L,0,L)

[Bibha]

I guess, I tried too hard :)

Thank you Matt, that worked!