Need help selecting the max of array A, then selecting corresponding array B

n=input('How many countries will be evaluated? ')
for k=1:1:n
    %cn=country name
    cn(k)={input('Enter Country name:   ','s')};
    %we=wind energy
    we(k)=input('Enter Generated Wind Energy, in TWh  ');
    %te=total energy
    te(k)=input('Enter Total Electrical Energy, in TWh  ');
%pe=percent of energy
    pe(k)=we(k)*100/te(k);
end

So in this case the two important arrays are pe and cn, or percent of energy and country name.

I need the program to evaluate the array pe and find the max; then find the country name that it corresponds too. I'm really at a loss for how to accomplish this!

Any help/insight is appreciated.

Answer 1

[Wayne King]

The problem is the 's' at the end of your fprintf() statement

   printf('\n The country with the lowest percentage of wind energy is  %s  with %2.2f \n',countrynameMIN,minpe)

[Michael]

YES! Thank you!

I thought the 's' was required when you were calling a string?

[Wayne King]

No, here the string is taken care of with your %s

Answer 2

[Babak]

At the end of your code add these lines:

 [maxPE,index] = max(pe);

 countryNameMAX = cn(index)

maxPE and countryNameMAX give you what you need.

[Michael]

[maxpe,index] = max(pe);
countrynameMAX=cn{index};
fprintf('\n The country with the highest percentage of wind energy is %s with %.2f',countrynameMAX,maxpe,'s')

%Calculating minimmum value of PE, indexing, then using index to find
%corresponding country value. 
[minpe,index] = min(pe);
countrynameMIN=cn{index};
fprintf('\n The country with the lowest percentage of wind energy is %s with %.2f',countrynameMIN,minpe,'s')

But the output is;

<<The country with the highest percentage of wind energy is Spain with 92.25

 The country with the highest percentage of wind energy is s with 

 The country with the lowest percentage of wind energy is sweoi with 3.67

 The country with the lowest percentage of wind energy is s with 

 The average percent of wind energy for all 4 countries is 58.98

What happened?

You guys were both really quick to reply. I think it's awesome and really appreciate the help.

Answer 3

[Wayne King]

What about just

    [maxval,index] = max(pe);
    cn{index}

By using cn{index} you get the country back as a string -- a character array. Using

cn(index)

you get the country back as a 1x1 cell array

[Michael]

[maxpe,index] = max(pe);
countrynameMAX=cn{index};
fprintf('\n The country with the highest percentage of wind energy is %s with %.2f',countrynameMAX,maxpe,'s')

%Calculating minimmum value of PE, indexing, then using index to find
%corresponding country value. 
[minpe,index] = min(pe);
countrynameMIN=cn{index};
fprintf('\n The country with the lowest percentage of wind energy is %s with %.2f',countrynameMIN,minpe,'s')

But the output is;

<<The country with the highest percentage of wind energy is Spain with 92.25

 The country with the highest percentage of wind energy is s with 

 The country with the lowest percentage of wind energy is sweoi with 3.67

 The country with the lowest percentage of wind energy is s with 

 The average percent of wind energy for all 4 countries is 58.98

What happened?

You guys were both really quick to reply. I think it's awesome and really appreciate the help.

Answer 4

[Michael]

[maxpe,index] = max(pe);
countrynameMAX=cn{index};
fprintf('\n The country with the highest percentage of wind energy is %s with %.2f',countrynameMAX,maxpe,'s')

%Calculating minimmum value of PE, indexing, then using index to find
%corresponding country value. 
[minpe,index] = min(pe);
countrynameMIN=cn{index};
fprintf('\n The country with the lowest percentage of wind energy is %s with %.2f',countrynameMIN,minpe,'s')

But the output is;

<<The country with the highest percentage of wind energy is Spain with 92.25

 The country with the highest percentage of wind energy is s with 

 The country with the lowest percentage of wind energy is sweoi with 3.67

 The country with the lowest percentage of wind energy is s with 

 The average percent of wind energy for all 4 countries is 58.98

What happened?

You guys were both really quick to reply. I think it's awesome and really appreciate the help.