pls finding error" Undefined function or variable "t"." while executing

char t= 'hello123';
      t=uint8(t);
        len=length(t)
         pow=[];
         cipher_text=[];
           for i=1:len                                   
               pow=[pow;t(i).^(enckey)];  %each element of the pt matrix(plain text) is raised    to the power of encryption key(enc_key) and stored in pow matrix(power matrix)
    cipher_text=[cipher_text;mod(pow(i),n)];% cipher text is calculate

Answer 1

[Ajay Pherwani]

just remove 'char' keyword in the 1st line , and make it as t='hello 123' ; t=uint8(t); .. and so on