Double integral in MATLAB

[a_ronagh]

double integral matlab

Hi everybody

Do you know how to calculate a double integral in MATLAB when the
inner integral limits are themselves functions of the outer variable?
Considering that I don't want to change the variables.

 

[b.pricope]

matlab double integral

Have you tried dblquad function to numerically integrate it?
It is well explained in Matlab help for details.

Maybe you can show me the function, thus I could give you a more specific answer.

 

[steve10]

double integration matlab

You can do it in at least two ways (that I know):

1. (the best) use function 'int'.

Go ahead to try the following:

syms x y
f=inline('x.^2 + y.^2')
int(int(f(x,y),0,exp),0,1)

2. use function 'dblquad', but you need to redefine your function f(x,y) in the rectangle which includes your original integration range. In the additional part, you define f(x,y)=0.

 

[hamidr_karami]

matlab double integration

hi
you can use any way
for example
>> dblquad('x*y',-1,1,-1,1)

ans =

0

>> dblquad('x*y',0,1,0,1)

ans =

0.2500

>> syms x y
f=inline('x.^2 + y.^2')
int(int(f(x,y),0,exp),0,1)

f =

Inline function:
f(x,y) = x.^2 + y.^2


ans =

1/9*exp(1)^3+exp(1)-19/9
bye

 

[ylml]

double integral in matlab

hi everybody do you know how to calculate the expression "1/sqrt(x^2+y^2)" in double integral, i mean dblquad('1/sqrt(x^2+y^2)',0,1,0,1)

I tried it but matlab gives an error about"mpower"

thank you in advance