# Undefined operator '*' for input arguments of type 'cell'

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Vraj Pandya on 30 Oct 2017
Commented: Star Strider on 31 Oct 2017
I am getting this error-"Undefined operator '*' for input arguments of type 'cell'".
T1=T(i,1);
u1=u(i,1);
Rn1=Rn(i,1);
RH1=RH(i,1);
e=0.61078*exp(17.269*{T1}/(237.3+{T1}));
d=e*(17.269/(237.3+{T1}))*(1-({T1}/(237.3+{T1})));
y=0.665-3*96.7;
G=0.5*Rn1;
ET=(0.408*(d(T1))*(Rn1-G(Rn1))+y*(900/({T1}+273))*u1*e(T1)*(1-RH1))/(d(T1)+y*(1+0.34*{u1}));

Star Strider on 30 Oct 2017
You are using curly brackets ‘{}’ here and in later assignments:
e=0.61078*exp(17.269*{T1}/(237.3+{T1}));
They define a cell, and since cells can contain anything — including character variables — arithmetic operators are not defined for them. You have to remove numeric data from cell arrays to use them in numeric calculations.
Since we can assume ‘T1’ is numeric, the solution is simply to remove the curly brackets:
e = 0.61078*exp(17.269*T1/(237.3+T1));
Unless matrix ‘T’ has previously been defined as a cell array (we can’t tell from the code you posted), that should work.

Walter Roberson on 31 Oct 2017
T1=T(i,1);
u1=u(i,1);
Rn1=Rn(i,1);
RH1=RH(i,1);
e=0.61078*exp(17.269*T1/(237.3+T1));
d=e*(17.269/(237.3+T1))*(1-(T1/(237.3+T1)));
y=0.665-3*96.7;
G=0.5*Rn1;
ET=(0.408*(d)*(Rn1-G)+y*(900/(T1+273))*u1*e*(1-RH1))/(d+y*(1+0.34*u1));
Vraj Pandya on 31 Oct 2017
Thanks a lot @Walter @Stephen @Strider code worked :)
Star Strider on 31 Oct 2017
Our pleasure!