num2str or str2num?

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Ryan Grace
Ryan Grace 2012-4-29
I am trying to make a table of numbers with corresponding names for example: names and grade table sorted by the number
Bob 97
Joe 87
Sally 88
How do i setup a variable to equal something like a= Bob 97 so when i go to do the fprintf it will sort by the numbers in the second column and leave the corresponding names to the number in the first column
final table should look like:
Name Grade
Joe 87
Sally 88
Bob 97
  2 个评论
per isakson
per isakson 2012-4-29
Why not int2str?
Image Analyst
Image Analyst 2012-4-29
Because he wants it sorted by grade, and the grade doesn't necessarily show up in the same column, or even in a single column, if the names have different lengths:
>> int2str('Sally 88')
ans =
83 97 108 108 121 32 32 32 56 56

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采纳的回答

Image Analyst
Image Analyst 2012-4-29
Ryan, if you can read in from your input (say, with textscan) and stuff the name into a cell array and stuff the numbers into a double array, then you can sort the double array and sort the cell array the same way, like in this (untested) code:
% Create sample data:
names = {'Bob'; 'Joe'; 'Sally'}
grades = [97 87 88]
% Now sort by ascending grade number:
[sortedGrades sortOrder] = sort(grades, 'ascend');
% Sort the names the same way.
sortedNames = names(sortOrder);
% Now print out to the command window.
fprintf('Name Grade\n');
for k = 1 : length(sortedGrades)
fprintf('%s %d\n', sortedNames{k}, sortedGrades(k));
end
In the command window:
names =
'Bob'
'Joe'
'Sally'
grades =
97 87 88
Name Grade
Joe 87
Sally 88
Bob 97
  3 个评论
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Image Analyst
Image Analyst 2012-4-29
Yeah, that's hard, unless you want to use a uitable. The tab (\t) is somewhat unreliable as to where it places the next column. What I do is to set the font to a fixed spacing font like Courier (I know, Courier is not "pretty" though) and then use fixed length fields, e.g. %20s or %7d to line things up.
Ryan Grace
Ryan Grace 2012-4-29
Ya i just used a number in front of the %s and %f and it looks decent enough for what i am doing. Thanks for your help.

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