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

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Michael
Michael 2012-9-18
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.

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采纳的回答

Wayne King
Wayne King 2012-9-18
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)

更多回答（3 个）

Babak
Babak 2012-9-18
At the end of your code add these lines:
[maxPE,index] = max(pe);
countryNameMAX = cn(index)
maxPE and countryNameMAX give you what you need.
  1 个评论
Michael
Michael 2012-9-18
[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.

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Wayne King
Wayne King 2012-9-18
编辑：Wayne King 2012-9-18
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
  1 个评论
Michael
Michael 2012-9-18
[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.

请先登录，再进行评论。

Michael
Michael 2012-9-18
编辑：Michael 2012-9-18
[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.

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