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How to convert grade into letter grade

Asked by Jiawei Weng on 20 Jan 2019
Latest activity Commented on by Jiawei Weng on 21 Jan 2019
Hi guys, wonder how to transfer grade into letter grade. I have already calculated the code, which is following:
NA = 4;
PS = [75, 62, 80, 71, 0, 32, 56, 80];
PR = 68;
EM = 78;
n=2;
u=unique(PS)
if numel(u)==1 || numel(u)==2
Result=[]
else
Result=mean(PS(~ismember(PS,u(1:n))))
end
a = Result
if NA <= 2
b = 15
end
if NA == 3
b = 14
end
if NA == 4
b = 13
end
if NA == 5
b = 12
end
if NA == 6
b = 11
end
if NA == 7
b = 10
end
if NA == 8
b = 9
end
if NA == 9
b = 8
end
if NA == 10
b = 7
end
if NA == 11
b = 6
end
if NA == 12
b = 5
end
c = PR*0.3
d = EM*0.2
e = a*0.35
grade = b + c + d + e
NA = 1;
PS = [90, 100, 100, 84, 89, 92, 73];
PR = 96;
EM = 0;
n=2; % two smallest values
u=unique(PS)
if numel(u)==1 || numel(u)==2
Result=[]
else
Result=mean(PS(~ismember(PS,u(1:n))))
end
a = Result
if NA <= 2
b = 15
end
if NA == 3
b = 14
end
if NA == 4
b = 13
end
if NA == 5
b = 12
end
if NA == 6
b = 11
end
if NA == 7
b = 10
end
if NA == 8
b = 9
end
if NA == 9
b = 8
end
if NA == 10
b = 7
end
if NA == 11
b = 6
end
if NA == 12
b = 5
end
c = PR*0.3
d = EM*0.2
e = a*0.35
grade = b + c + d + e
I know I am super unskilled lol. Anyway, at first I tried
function grade=letter_grade
if grade >= 91
letter_grade='A';
elseif n >= 81
letter_grade='B';
elseif n >= 71
letter_grade='C';
elseif n >= 61
letter_grade='D';
else
letter_grade='F';
end
end
but it doesn't work. Please help me with that, thanks in advance.
PS: 90-100 A+
80-89 A
70- 79 B
60-69 C
50-59 D
below 50 F

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R2018b

1 Answer

Answer by per isakson
on 20 Jan 2019
Edited by per isakson
on 21 Jan 2019
 Accepted Answer

I guess this is what you intended
function grade = letter_grade( n )
if n >= 91
grade='A';
elseif n >= 81
grade='B';
elseif n >= 71
grade='C';
elseif n >= 61
grade='D';
else
grade='F';
end
end
and test the function
>> letter_grade( 75 )
which returns "C"
However, note that this function will not give results according to
PS: 90-100 A+
80-89 A
70- 79 B
60-69 C
50-59 D
below 50 F
but it runs without errors.

  5 Comments

It is pretty weird that I put it in Command window, but it shows " Undefined function or variable 'letter_grade'." But I believe I have defined that, what am I doing wrong. Do I need to set any thing before I typr letter_grade?
IMO: It is not possible to effectively use Matlab without constantly consulting the documentation. See Create Functions in Files.
"Do I need to set any thing before I typr letter_grade?" YES
  1. Create a file named, letter_grade.m, that contains the code of the function
  2. Save that file in a folder that is in the Matlab search path, i.e. see Search Path
Great! it works perfectly, thank you so much sir.

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