Can anybody help me to solve this?

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ASWATHI V
ASWATHI V 2018-12-1
评论： ASWATHI V 2018-12-2
How can I compute this integral (numerical integration) in matlab?
integral (integral(f1(x))*integral(f2(x)))
where the inner integrals have same limit and the outer integral is from zero to infinity.
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Walter Roberson
Walter Roberson 2018-12-1
f3 = @(y) integral(f1,(I/p_umax),inf);
f4 = @(y) integral2(f2,(I/p_umax),inf);
You used integral2() for f2, but you only supplied one set of bounds. It should probably be integral()
ASWATHI V
ASWATHI V 2018-12-2
''I'' is a constant.
I have changed integra2

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Walter Roberson
Walter Roberson 2018-12-1
After having defined f1 and f2 as symbolic functions, and assigning values to the limits
int( int(f1(x), x, inner_limit_low, inner_limit_high) * int(f2(x), x, inner_limit_low, inner_limit_high), variable_of_outer_integration, 0, inf)
Note that variable_of_outer_integration cannot be x: you defined the inner integrations as being definite integrals, so the function argument x will not appear in the result of their int()
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ASWATHI V
ASWATHI V 2018-12-2
I = 1000;
sig_2 = 1;
P_p = 100;
lamda_1 = 1;
lamda_I1 = 1.5;
lama_I3 = 1.5;
alpha_1 = 0.3;
ASWATHI V
ASWATHI V 2018-12-2
x from 0 to infinity
y from some value (it could be any positive value hich depends on so many other values, let it be 100) to infinity

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