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Having difficulty performing symbolic integral

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Faraz Vossoughian
Faraz Vossoughian 2017-12-18
关闭： MATLAB Answer Bot 2021-8-20
In my code the part im trying to calculate A0 , A1,A2 and zerolift i get the following error
Invalid indexing or function definition. Indexing must follow
MATLAB indexing. Function arguments must be symbolic variables,
and function body must be sym expression.
please someone help me.
Thank you,
syms xc tetan
alpha=input('alpha in D')
alpha=deg2rad(alpha);
zc= 0.48*xc*(xc-1)^2;%change
dzdx=diff(zc,xc);%change
xc=0.5*(1-cos(tetan));
dzdx=(12*xc*(2*xc - 2))/25 + (12*(xc - 1)^2)/25;
%A0
int=int(dzdx,tetan,0,pi);
int=int/pi;
Anot=alpha-(int)
%A1
n=1
int1=int(dzdx*(cos(1*tetan)),tetan,0,pi);%first part
A1=(2/pi)*(int1)
%A2
n=2
int2=int(dzdx*(cos(2*tetan)),tetan,0,pi);%first part
A2=(2/pi)*(int2)
%zerolift
int3=int((cos(tetan)-1)*dzdx,tetan,0,pi)
alphaZ=(-1/pi)*int1;

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回答（1 个）

Walter Roberson
Walter Roberson 2017-12-18
Your line
int=int(dzdx,tetan,0,pi);
redefines int from being a function into being a variable.
  2 个评论
Walter Roberson
Walter Roberson 2017-12-18
Do not use int as a variable name.
temp1 = int(dzdx,tetan,0,pi);
temp2 = temp1 / pi;
Anot = alpha - temp2;

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