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

2014 1 22
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更新时间：2014 1 22
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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)

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回答（1 个）

Roger Stafford
Roger Stafford 2014-1-22

0 个投票

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'.

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