Sort a table in ascending order
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Hi
How can I sort a table-type array in ascending order
For example
First mode
To:
TNX :)
1 个评论
Stephen23
2020-11-12
@Shahar ben ezra: you should transpose the way your table is arranged, otherwise it will be a nightmare to work with (both in Excel and MATLAB).
采纳的回答
Steve Eddins
2020-11-12
编辑：Steve Eddins
2020-11-12
The answer would be relatively straightforward, as well as much more efficient, if you would orient your table the other way. With data such as yours, table is really designed to be used this way:
>> Name = ["roni" ; "tim" ; "jon" ; "lie" ; "kim"];
>> TestScore = [90 ; 45 ; 67 ; 84 ; 32];
>> T = table(Name,TestScore)
T =
5×2 table
Name TestScore
______ _________
"roni" 90
"tim" 45
"jon" 67
"lie" 84
"kim" 32
Then you could sort the table using sortrows:
>> T2 = sortrows(T,"TestScore")
T2 =
5×2 table
Name TestScore
______ _________
"kim" 32
"tim" 45
"jon" 67
"lie" 84
"roni" 90
5 个评论
Shahar ben ezra
2020-11-12
Steve Eddins
2020-11-12
Excel also generally functions better when data is stored in columns rather than rows. Are you able to make this change to your spreadsheet? If so, then you can use readtable:
T = readtable(filename,"TextType","string");
Shahar ben ezra
2020-11-12
This is an example of something much bigger
I can not change the columns and rows
Do you know why it does not work?
Steve Eddins
2020-11-12
The convention of storing tabular data column-wise is almost universal today. Excel itself follows it. A couple of months ago, there were some articles in the press about a UK coronavirus dataset that was corrupted because the data was stored row-wise in an Excel spreadsheet.
You can still get it done with your spreadsheet files, though. It just requires a few extra steps. One way is to read the Excel file into a cell array and then manipulate the cell array to get the desired MATLAB table, like this:
>> C = readcell('wrong-way.xlsx')
C =
2×6 cell array
Columns 1 through 5
{'Name' } {'roni'} {'tim'} {'jon'} {'lie'}
{'Test score'} {[ 90]} {[ 45]} {[ 67]} {[ 84]}
Column 6
{'kim'}
{[ 32]}
>> Name = string(C(1,2:end))'
Name =
5×1 string array
"roni"
"tim"
"jon"
"lie"
"kim"
>> TestScore = cell2mat(C(2,2:end))'
TestScore =
90
45
67
84
32
>> T = table(Name,TestScore)
T =
5×2 table
Name TestScore
______ _________
"roni" 90
"tim" 45
"jon" 67
"lie" 84
"kim" 32
>> T2 = sortrows(T,"TestScore")
T2 =
5×2 table
Name TestScore
______ _________
"kim" 32
"tim" 45
"jon" 67
"lie" 84
"roni" 90
Shahar ben ezra
2020-11-12
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