How to find first 10 minimum values in a table array?

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Ivan Mich
Ivan Mich 2023-1-30
评论： Stephen23 2023-1-30
I have a table array with 5 columns (1,2,3,5 are numbers and column 4 have letters). (I am uploading one example of this array) I would like to exctract from this array the first 10 minimum values, depending the number in column 3.
I tried these
but are no use for my purpose.
T=readtable('input.txt');
A=T(:,1);
B=T(:,1);
C=T(:,1);
D=T(:,1);
E=T(:,1);
Minm=min(T,[],1)
Could you please help me?

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Aritra
Aritra 2023-1-30
Hi,
As per my understanding you are trying to extract the first 10 minimum rows from your input table array, depending on the values in column 3.
To solve this, you can use the B = sortrows(input,3) function to sort the rows of your input table array based on 3rd column values. The direction argument can be used to specify the sorting direction. The default direction argument is set to ‘ascending’.
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1278020/input.txt');
A = sortrows(T,3);
Result = A(1:10,:);
For detail, please see this MathWorks documentation below for more information on sortrows: https://in.mathworks.com/help/matlab/ref/double.sortrows.html#d124e1400369

更多回答（2 个）

KSSV
KSSV 2023-1-30
编辑：KSSV 2023-1-30
Ran in:
You can sort the array you want and arrange the other arrays/ table into that order. You can pick the first whatever number you want after arraning in the descending order.
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1278020/input.txt') ;
c1 = T.(1) ;
c2 = T.(2) ;
c3 = T.(3) ;
c5 = T.(5) ;
[val,idx] = sort(c3) ;
iwant = T(idx,:)
iwant = 24×5 table
Var1 Var2 Var3 Var4 Var5 ______ ______ ______ __________ ____ 38.965 23.148 40.857 {'NDFNE' } 2.5 38.764 23.334 67.625 {'KJCAKB'} 4 38.371 22.854 90.605 {'B' } 4 38.337 23.34 106.38 {'GG' } 6 38.392 21.824 120.07 {'EEGD' } 4 38.242 22.082 120.33 {'BHSTH' } 5 38.041 23.274 134.41 {'SD' } 6.5 38.253 21.777 134.43 {'UUU' } 5 38.019 22.104 141.67 {'UUUUUB'} 3 38.392 21.436 145.06 {'BF' } 2 39.138 20.993 153.03 {'KVJU' } 4 38.882 24.506 153.89 {'KNEREW'} 4 38.506 21.102 162.66 {'A' } 4 37.663 22.125 178.03 {'G' } 6 37.673 22.038 179.51 {'KKKK' } 4 37.56 22.807 180.5 {'ERTT' } 7.5
  2 个评论
Ivan Mich
Ivan Mich 2023-1-30
Thank you but I would like to pick automnatically the first 10 minimum values of this table. I mean I would like to have the attached output eith a use of a command or function.
38.965 23.148 40.85728 NDFNE 2.5
38.764 23.334 67.6252 KJCAKB 4
38.371 22.854 90.60469 B 4
38.337 23.34 106.3843 GG 6
38.392 21.824 120.0669 EEGD 4
38.242 22.082 120.3349 BHSTH 5
38.041 23.274 134.4077 SD 6.5
38.253 21.777 134.4266 UUU 5
38.019 22.104 141.6738 UUUUUB 3
38.392 21.436 145.0648 BF 2
Could you please help me?
Askic V
Askic V 2023-1-30
编辑：Askic V 2023-1-30
Ran in:
Okay, but can you give us example, what is that you expect from this particular example. You know, by definition it cannot exist 10 minimum values. I thought you need 10 values from one particular column, but when you say from the table, I'm not sure what that means.
T = readcell('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1278020/input.txt');
column = 3; % column by which you want to sort
T_sort = sortrows(T, column); % sort by column
T_sort(1:10,:) % show first 10 values
ans = 10×5 cell array
{[38.9650]} {[23.1480]} {[ 40.8573]} {'NDFNE' } {[2.5000]} {[38.7640]} {[23.3340]} {[ 67.6252]} {'KJCAKB'} {[ 4]} {[38.3710]} {[22.8540]} {[ 90.6047]} {'B' } {[ 4]} {[38.3370]} {[23.3400]} {[106.3843]} {'GG' } {[ 6]} {[38.3920]} {[21.8240]} {[120.0669]} {'EEGD' } {[ 4]} {[38.2420]} {[22.0820]} {[120.3349]} {'BHSTH' } {[ 5]} {[38.0410]} {[23.2740]} {[134.4077]} {'SD' } {[6.5000]} {[38.2530]} {[21.7770]} {[134.4266]} {'UUU' } {[ 5]} {[38.0190]} {[22.1040]} {[141.6738]} {'UUUUUB'} {[ 3]} {[38.3920]} {[21.4360]} {[145.0648]} {'BF' } {[ 2]}
You can just enter column = 3 in my previous code and display 10 values from the matrix

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Askic V
Askic V 2023-1-30
Ran in:
Another solution is to use readcell function instead of read table.
T = readcell('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1278020/input.txt'); % read from file
column = 1; % column by which you want to sort
T_sort = sortrows(T, column); % sort by column
T_sort(1:10, column) % show first 10 values
ans = 10×1 cell array
{[37.1780]} {[37.3690]} {[37.3980]} {[37.4160]} {[37.5600]} {[37.5730]} {[37.6050]} {[37.6630]} {[37.6730]} {[37.6980]}

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