Assigning letter grades code

Hello, I'm trying to do an assignment that has to calculate mean and assign letter grades to grades from an excel document. I've successfully got the mean but I cant get the letter grade part to work. Any suggestions?

endgradebook = xlsread('E');
display (gradebook)
for i=1:95
average(i)= mean(gradebook(i,1:5));
end
display(average)
for i=1:95
  average(i)=mean(gradebook(i,1:5);
  if(average(i)<=59)
      letter{i}= 'F';
  elseif(average(i)<=69)
      letter{i}= 'D';
  elseif(average(i)<=79)
      letter{i}= 'C';
  elseif(average(i)<=89)
      letter{i}= 'B';
  else
      letter{i}= 'A';
  end
end

[Walter Roberson]

Your second calculation of average(i) is not needed because you have already calculated it a few lines above.

There is nothing obviously wrong with your assignment of letter grades; what difficulty are you observing?

When you use a cell array for the letter grades instead of a character array or character vector, that is a valid thing to do, but a character array or character vector would also be valid under the condition that each letter grade is exactly one character. For example, a grade of A- is handled easily by a cell array but not a character vector (but it could be handled with a character array if you were careful.)

[Not_sharpest_tool.mat]

Thanks, the problem was the second mean calculation. I erased it and it worked.

[Walter Roberson]

Should not have made a difference, it was just repeating what had already been calculated.

Answer 1

[Cris LaPierre]

Your second calculation of mean is missing a closing parentheses, though that may just be a copy/paste error.

...
for i=1:95
  average(i)=mean(gradebook(i,1:5);
...