IF statements, and its outputs.

Question

Benaiah 2011-8-3

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How should I code the if statements so I can organise the 10 outputs of each if statement into a row vector; of which I will further on place into a matrix with a few a few other row vectors?. The Marks row vector is filled prior to the 2 if statements.

Marks = [MarkAnn,MarkBob,MarkJan,MarkJim,MarkJoe,MarkKai,MarkPam,MarkSam,MarkTom,MarkZoe];
Percentages = Marks*10;
for a=1: length(Marks)
if Marks>=5
      grade = PASS
else
      grade = FAIL
end
end
for a=1: length(Percentages)
if Percentages<50
      gpa = FAIL
elseif Percentages>=50, Percentages<65
      gpa = PASS
elseif Percentages>=65, Percentages<75
      gpa = CREDIT
elseif Percentages>=75, Percentages<85
      gpa = DISTINSTION
elseif Percentages>=85
      gpa = HIGH_DICTINCTION
end
end

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Answer 1

Arnaud Miege 2011-8-3

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One possible solution:

grade = cell(size(Marks));
for a=1: length(Marks)
    if Marks(a)>=5
       grade{a} = 'PASS';
    else
       grade{a} = 'FAIL';
    end
end

Use a similar approach for gpa. It might possible to vectorize the for loops.

HTH,

Arnaud

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Benaiah 2011-8-3

What u suggested worked, as i now get all the row vectors needed for the matrix in the workspace.

But it returns the error "??? Error using ==> vertcat

CAT arguments dimensions are not consistent." Therefore stopping the output of the matrix.

How can i stop that error from occurring??

Arnaud Miege 2011-8-5

Which line of code does the error point to? Can you post your updated code?

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Answer 2

bym 2011-8-10

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Percentages=rand(10,1)*100;
gpa = cell(1,length(Percentages));
for a = 1:length(Percentages)
      if Percentages(a) < 50
          gpa{a} = 'fail';
      elseif Percentages(a) >=50 && Percentages(a) < 65
          gpa{a} = 'pass';
      elseif Percentages(a) >=65 && Percentages(a) < 75
          gpa{a} = 'credit';
      elseif Percentages(a) >=75 && Percentages(a) < 85
          gpa{a} = 'distiction';
      else
          gpa{a} = 'high distinction';
      end   %if
  end %for
    gpa'

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Answer 3

Walter Roberson 2011-8-11

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NameMarkGradeGPA = [Names;num2cell(Marks);Grade;GPA]

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Benaiah 2011-8-12

Thanks for all the help guys, i really appreciate it.

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Answer 4

Benaiah 2011-8-11

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Everything works, but it won't give me the output matrix due to the same error of

"??? Error using ==> vertcat CAT arguments dimensions are not consistent."

I know the Marks row vector is causing the problem as the code below demonstrates.

 NameMarkGradeGPA = [Names;Grade;GPA]
NameMarkGradeGPA = 
Columns 1 through 9
    'Ann'     'Bob'     'Jan'     'Jim'     'Joe'     'Kai'     'Pam'       'Sam'            'Tom'             
    'FAIL'    'FAIL'    'FAIL'    'FAIL'    'PASS'    'PASS'    'PASS'      'PASS'           'PASS'            
    'FAIL'    'FAIL'    'FAIL'    'FAIL'    'PASS'    'PASS'    'CREDIT'    'DISTINSTION'    'HIGH_DICTINCTION'
Column 10
    'Zoe'             
    'PASS'            
    'HIGH_DICTINCTION'