Create a new .dat file by editing an existing one

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Vicky 2019-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/493014-create-a-new-dat-file-by-editing-an-existing-one

评论： Vicky 2019-11-26

Hi,

Iv'e got a .dat file and I would like to edit it by removing some elements in the mid of the columns and adding zeros in the beggining and end of it. I used the folowing lines to enter the exisitng .dat file and then create a new one

data_in = dlmread('old_data.dat');
data_out = [data_in(:,1), data_in(:,2), data_in(:,3)];
save new_data.dat data_out -ASCII

How can we remove elements from some points of the 'old_data.dat' and add zeros in some other, so that the 'new_data.dat ' will have the same size with the first/exisitng one?

Any help would be greatly appreciated.

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per isakson 2019-11-26

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I cannot understand where you found the values

[6,2,2,3,3,1]

that you have assigned to the third column.

And "two values of 3rd column, 7 and 1, and added 2 zeros instead" is hard to interpret given your required matrix.

Anyhow "given your example can you modify M so that you eventulay get the following"

%% My example    
M = [
     9     9     4
     9     6     6
     5     1     2
     8     8     7
     2     9     1
     4     7     3
     9     7     1
     8     7     1 ];
 %%
 M(2:7,3) = reshape( [6,2,2,3,3,1], [],1 );
 M([1,8],3) = 0;
 disp(M) 

displays

which is identical to your required matrix of the previous comment. (In your previous example you shuffled the rows in a way that I failed to understand.)

Before trying to make useful code you need to