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What is the problem in simple matrix operation.?

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Nimisha
Nimisha 2014-11-23
评论： Azzi Abdelmalek 2014-11-23
clear all;clc
names = {'A'; 'B'; 'C'; 'D'};
marks = [27; 48; 84; 22];
in_st = {names marks};
in_st = [names num2cell(marks)];
function [op_st1,op_st2] = print_Data(in_st)
in_st = in_st;
[~,idx] = sort(in_st(:,1));
op_st1 = in_st(idx,:)
[~,idx] = sort(in_st(:,2),'descend');
op_st2 = in_st(idx,:)
I want op_st1 in ascending order, and op_st2 in descending order. It works well upto half program, what is the problem in remaining..?
  2 个评论
Nimisha
Nimisha 2014-11-23
Error using sort
DIM and MODE arguments not supported for cell arrays.
Error in print_Data (line 6)
[~,idx] = sort(in_st(:,2),'descend');
The above error message i am getting

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采纳的回答

Guillaume
Guillaume 2014-11-23
As the error message says and the documentation of sort states, you can't use the DIM and MODE arguments when sorting cell arrays.
However, since the descending order is just the reverse of the ascending order, why don't you just flip your first sort?
[~, idx] = sort(in_st(:, 1));
op_st1 = in_st(idx, :);
op_st2 = in_st(flipud(idx), :);
  2 个评论
Nimisha
Nimisha 2014-11-23
ITS true what you understand. In my program, i mean to say that, as a fisrt
op_st1
i want to ascend names, that is true in program, BUT in
op_st2
i want to descend marks, means second column..! Still not working.""
Guillaume
Guillaume 2014-11-23
Oh, yes, sorry, I missed that. You can still reverse do what I said but on column 2:
[~, idx] = sort(in_st(:, 2));
op_st2 = in_st(flipud(indx), :);
Or you could convert column 2 to matrix:
[~, idx] = sort(cell2mat(in_st(:, 2)), 'descend');

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-11-23
编辑：Azzi Abdelmalek 2014-11-23
Use curly brackets { }
[~,idx] = sort(in_st{:,2},'descend')
  3 个评论
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Nimisha
Nimisha 2014-11-23
Error using sort
Too many input arguments.
Error in print_Data (line 6)
[~,idx] = sort(in_st{:,2},'descend')

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