Manipulating a text file

Hi all. I am trying to replace one of the columns within my text files with a column of zeros. I have been trying to do this by reading each of the columns in the file, replacing the desired column with a matrix of 0's and then writing this to a new file. When running the code the following error is produced which i havent seen before:

Error using horzcat Dimensions of matrices being concatenated are not consistent.

Error in ZlessData (line 13) J = [J1 J2 J3 J4 J5];

Here's the code and data file. Can anyone help?

function ZlessData
Jupiter = dlmread('1959-2019Jupiter.txt');
J1 = Jupiter(:,1);
J2 = Jupiter(:,2);
J3 = Jupiter(:,3);
J5 = Jupiter(:,5);
x = (size(Jupiter,1));
J4(1,x) = 0
J = [J1 J2 J3 J4 J5];
fidJ = fopen('1959-2019JupiterZless','w');
fprintf(fidJ, '%f %f \r\n', [J]');
fclose(fidJ);

Answer 1

[Walter Roberson]

function ZlessData
Jupiter = dlmread('1959-2019Jupiter.txt');
J = Jupiter;
J(:,4) = 0;
fidJ = fopen('1959-2019JupiterZless','w');
fprintf(fidJ, '%f %f \r\n', [J]');
fclose(fidJ);

[james flynn]

Thank you. However, it still changes the layout of the document into what seems to be like a continuous string of data. I require the document to have the data layed out in rows like this, as it is in the original document:

 1993   1  0.983   0.00  100.58   -3.04  264.11   24.73
 1993   2  0.983   0.00  101.60   -3.16  251.00   25.75
 1993   3  0.983   0.00  102.62   -3.27  237.82   26.76
 1993   4  0.983   0.00  103.64   -3.39  224.65   27.78
 1993   5  0.983   0.00  104.66   -3.50  211.48   28.79

[Walter Roberson]

S = fileread('1959-2019Jupiter.txt');
linelen = find(S==10,1,'first');
Scol = reshape(S, linelen, []).';
Scol(:,18:19) = ' ';
Scol(:,20:23) = '0';
Scol(:,21) = '.';

fidJ = fopen('1959-2019JupiterZless.txt','w');
fwrite(fidJ, Scol.');
fclose(fidJ);

Note: the code in the above form relies upon each line being exactly the same length and the column widths being exactly what your file has.