Using strcat within the fitrm function

Hi All. Just wondering why I cannot use strcat function to create the second inout for the fitrm function.

    CoV   = {'Patient','Gender','Dg'};
CoV2B = 3;
Var2BanalysedA = {'Perc_Aff_t0'}; % Assessment at time 1
Var2BanalysedB = {'Perc_Aff_t1'}; % Assessment at time 2
Var2BanalysedC = {'Perc_Aff_t2'}; % Assessment at time 3
t     = [Table_RMA(:,CoV2B),Table_RMA(:,Var2Banalysed), Table_RMA(:,Var2Banalysed+30),Table_RMA(:,Var2Banalysed+60)];
model = strcat(VN(Var2BanalysedA),'-',VN(Var2BanalysedC),'~',CoV(CoV2B));
M     = dataset([1 2 3]','VarNames',{'Measurements'});  
rm    = fitrm(t,'Perc_Aff_t0-Perc_Aff_t2~Dg','WithinDesign',M);

I want to replace 'Perc_Aff_t0-Perc_Aff_t2~Dg' with 'model', Is that possible?

[KSSV]

What error you are getting?

[Luis Eduardo Cofré Lizama]

   Error using classreg.regr.FormulaProcessor (line 421)
The model specification must be a terms matrix, a model alias, or a model formula character vector.

Error in classreg.regr.MultivariateLinearFormula (line 46) f = [e-mail](varargin{:});

Error in RepeatedMeasuresModel.fit (line 1298) formula = classreg.regr.MultivariateLinearFormula(model,varNames);

Error in fitrm (line 67) s = RepeatedMeasuresModel.fit(ds,model,varargin{:});

[Luis Eduardo Cofré Lizama]

Same error if I use

rm  = fitrm(t,strcat(VN(Var2BanalysedA),'-',VN(Var2BanalysedC),'~',CoV(CoV2B)),'WithinDesign',M);

[Walter Roberson]

What is your function VN?

Answer 1

[Luis Eduardo Cofré Lizama]

Hi All, found the solution :). Perhaps the prob was my ignorance in using strings. rm = fitrm(t,modek{1},'WithinDesign',M); cheers

Eduardo