# Creating a MatLab code to convert numerical grades into letter grades.

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Robert Windham on 21 Sep 2019
Commented: Robert Windham on 22 Sep 2019
Hey all!
I've currently working on creating a code that will allow me to convert numbers into a letter grade that can be put into a single column vector (1X25) and I can't figure out how to make it work. I thought I may have been onto something with this:
lg=mn; %lg is just what I'm calling letter grade and mn in the mean grade of the students assignments (also a 1X25).
if 90<=mn<=100
disp('A')
elseif 80<=mn<=89
disp('B')
elseif 60<=mn<=79
disp('C')
elseif 40<=mn<=59
disp('D')
elseif mn<40
disp('F')
end
I don't recieve any errors when I run it but it also doesn't provide me with any letter grades.
Any help would be greatly appreciated!
V/R,
Bobby

David Hill on 21 Sep 2019
x(x>=60&x<70)='D';
x(x>=90)='A';
x(x>=80)='B';
x(x>=70)='C';
x(x<60)='F';
x=char(x);
This provides a char array
Robert Windham on 22 Sep 2019
I tried doing this with a character array but because I want to include the 25X1 into another huge matrix, it messes up the rest of the matrix (looks like wingdings when I run the code).
Thank you, though!

madhan ravi on 21 Sep 2019
Edited: madhan ravi on 21 Sep 2019
You should loop through mn and save the results as a cell array in a variable which is preallocated before loop using indexing. Or better just use logical indexing and store the results as a cell array.