spell cheaker stuck in loop

Ive got a simple enough problem code has to make sure user input is correct but Ive made a very ugly while loop and its not working at all probably needs to be completely redone, any tips are appreciated

if true
InputString = input('Input:', 's');
lenghtInput = length(InputString);
test = 'UuGgCcAa';
i = 1;
j = 1;
c = 1;
correctInput = false;
while correctInput ~= true
  if InputString(i) ~= test(j) || j == lenghtInput
      ++j;
      ++c;
     display(i)
     if c == 3
         c = 0;
         i = i + 1;
     end
  end
  correctInput = true;
end
%code
%it needs to check the only characters used are in the test variable

[riley collins]

i also know that I'm using too many counters as you can probably see

[Walter Roberson]

++j is not valid MATLAB syntax.

Why not just use strcmp() or strcmpi() ?

[riley collins]

i should have explained better, the code can contain any pattern or sequence but i need to make sure it only contains "ugca" and their upper case counter parts and ++j isnt syntax uhg im getting languages mixed up again i think....

[KSSV]

If you want to compare strings have a look on strcmp and strcmpi.

Answer 1

[Walter Roberson]

tf = ismember(InputString, 'UuGgCcAa');
correctInput = all(tf);

[riley collins]

could you please elaborate on the uses of "tf"?

[riley collins]

just to clarify this dose work thank you so much just trying to learn a bit

[Walter Roberson]

tf is an arbitrary variable name for this purpose. It could have been written as

are_individual_letters_correct = ismember(InputString, 'UuGgCcAa');
correctInput = all(are_individual_letters_correct);

The letters that are wrong would be

bad_letters = InputString(~are_individual_letters_correct);

ismember() checks each vector element in InputString against every element of 'UuGgCcAa' and returns true in the places that match and false in the places that do not match. If everything comes out as true then the entire string is valid.

[riley collins]

thanks i wasnt sure