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

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}));

Answer 1

[Star Strider]

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.

[Vraj Pandya]

Still not resolved! The error is in ET step! I have attached a formula which I want to write! Help me resolve!

[Walter Roberson]

    ET=(0.408*(d)*(Rn1-G)+y*(900/(T1+273))*u1*e*(1-RH1))/(d+y*(1+0.34*u1));

[Vraj Pandya]

@Walter Roberson now its showing "undefined operator '+' for input arguments of type 'cell'"

[Stephen23]

@Vraj Pandya: that is exactly the same problem, and the solution is exactly the same too. Read Star Strider's answer and Walter Roberson's comment again.

[Star Strider]

@Walter — Thank you!

@Stephen — Thank you!

[Walter Roberson]

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]

Thanks a lot @Walter @Stephen @Strider code worked :)

[Star Strider]

Our pleasure!