Error:DOUBLE cannot convert the input expression into a double array.

When I run this integration for limits [0 to (a/0.15)], I am getting error but not when the limits are [0 to 0.433](or any other number). Please suggest a correction or any other alternative approach.

syms y a

T = ((1.3-(1.517*(y^(3/2))))*(1-(2.308*y))*(0.567+y)/(sqrt(1-(5.325*y*y))));

f = int(T, y, 0, (a/0.15));

f2 = double(f)

Warning: Explicit integral could not be found.

??? Error using ==> mupadmex

Error in MuPAD command: DOUBLE cannot convert the input expression into a double array.

If the input expression contains a symbolic variable, use the VPA function instead.

Error in ==> sym.sym>sym.double at 927

            Xstr = mupadmex('mllib::double', S.s, 0);

Error in ==> matlab2 at 4

f2 = double(f)

Answer 1

[Roger Stafford]

The system could not find an explicit formula for the indefinite integral as a function of y. If you put definite numerical values on the limits of integration it could give a numerical solution, but with the symbol 'a' in one of the limits it could therefore not give a general formula in terms of 'a'.