MATLAB: When I integrate a constant over Tp I should get the constant but I don’t

integrate

I'm attempting to find the average value but have come up against a error.

When I integrate a constant over Tp I should get the constant but I don't?

>> T= 2*pi

>> ao=(1/T)*int(100.0,t,0,T) %Integrate the constant 100 over Tp to find the average

ao =

(143354028480566475*pi)/4503599627370496

Best Answer

Hi,

int is a Symbolic Toolbox function. Use either double or integral for direct numeric computation.

a0 = double((1/T)*int(100.0,t,0,T))

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It looks like you are trying to set a numeric value as the String property. You will first have to convert your symbolic values to char.

syms t n;
T=4;
w0=2*pi/T;
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a0=(1/T)*int(1,t,0,2);
an=(2/T)*int(1*cos(n*w0*t),t,0,2);
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set(handles.a0,'string',char(a0))
set(handles.an,'string',char(an))
set(handles.bn,'string',char(bn))

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syms a b c t
M=[cos(a)*sin(b)*cos(c) sin(a)*sin(b)*sin(c) cos(a)^2*sin(b)^2*cos(c)];
k = regexprep(char(M),{'\(a\)','\(b\)','\(c\)'},{'\(a\(t\)\)', '\(b\(t\)\)', '\(c\(t\)\)'});
out = feval(symengine,'diff', k, t)

ADD after rami's comment

z = feval(symengine,'diff', k, t);
out = sym(regexprep(char(z),'(\(t\))|(\*diff\([abc]\(t\), t\))',''))

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