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Problem in linsolve , the equation on the left side not accepted

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farzad
farzad 2014-12-8
评论： Geoff Hayes 2014-12-9
Hi All
I am defining equation as :
M_num = - (19*c2)/4 - (11*c3)/18 - 50 ;
M_n2 = - 7*c2 - (5*c3)/18 - 50 ;
then I have :
linsolve({M_num = 0, M_n2 = 0}, {c2, c3}) ;
and I get the error :
Error: The expression to the left of the equals sign is not a valid target for an assignment.
WHY ??

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Geoff Hayes
Geoff Hayes 2014-12-8
Farzad - see the documentation for linsolve. If you are trying to solve the system of equations Ax=B, then you need to define your A and B with two unknowns of c2 and c3, then you should try something like
A = [-19/4 -11/18 ; -7 -5/18];
B = [50 ; 5];
X = linsolve(A,B);
  2 个评论
Image Analyst
Image Analyst 2014-12-9
farzad's reply moved from being an "Answer" to being a comment:
Thanks Geof , but I was doing according to : here
and you see they wrote the equations directly , ok then , in this case , since I am letting matlab to repalce and produce the equations and then solve them , so I can not intervene in the middle and extract those coefficients to replace here , but is there a way to do this ?
Geoff Hayes
Geoff Hayes 2014-12-9
Farzad - you are referencing code that is used in the MuPad interface. Is that what you are using?

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