How to assign index to array

Question

Mekala balaji 2017-9-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/356958-how-to-assign-index-to-array

编辑： per isakson 2017-9-16

采纳的回答： per isakson

Hi,

I have data and want to assign the index to the data as below:

Input data:

col1 col2 col3 col4
   3   4    9
   5   5    7
   6   11   7
   3   7    2

I want to assign the index as the size of the data, here the size(rows) of the data is 4, then I want to add a column to assign the serial number as below:

Modified data(added 5th column):

   3   4    9   1
   5   5    7   2
   6   11   7   3
   3   7    2   4

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Answer 1

per isakson 2017-9-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/356958-how-to-assign-index-to-array#answer_281801

编辑：per isakson 2017-9-16

Try

>> M(:,end+1) = reshape( [1:size(M,1)], [],1 );
>> M
M =
     1     3     4     9     1
     3     5     5     7     2
     4     6    11     7     3
     0     3     7     2     4