Matrix dimensions must agree.
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where is the error please ???
clear,clc
cp=1005;
r=287;
d=1.2;
v=300;
tx=284;
px=98;
to=298;
py=100:200;
a1=((d*v*r).^2)./(2*cp.*py);
a2=1;
a3=-to;
p=[a1 a2 a3];
ty=roots(p);
ds=(cp.*log(ty./tx))-(r.*log(py./px));
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Réponses (4)
Sean de Wolski
le 28 Mar 2012
Error using - Matrix dimensions must agree. That is an error with '-' (minus). Going to the only minus:
Compare sizes:
(r.*log(py./px))
and
(cp.*log(ty./tx))
There is your problem.
Walter Roberson
le 28 Mar 2012
roots() returns a column vector, but everything else is a row vector.
Your a1 vector is the same length as py, but when you put a2 and a3 on the end of that, your p vector becomes 2 elements longer than py. roots() returns a vector one element shorter than its input vector, so roots() is going to return a vector one element longer than py. You then try to subtract between that vector of length of py + 1 and the vector of length of py.
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Andrei Bobrov
le 29 Mar 2012
cp=1005;
r=287;
d=1.2;
v=300;
tx=284;
px=98;
to=298;
py=(100:200).';
a1=((d*v*r).^2)./(2*cp.*py);
a2=1;
a3=-to;
p=[a1; a2; a3];
ty=roots(p);
Ty=ty(1:end-1);
ds=(cp.*log(Ty./tx))-(r.*log(py./px));
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