## How to remove fields with all zeros

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I have a `file`

that looks like this :

header,d0,d1,d2,d3, ... s1,0,5,2,8, ... s2,0,8,2,4, ... s3,0,7,3,4, ... s4,0,3,2,1, ... ...

I want to remove any column with all zeros like d0 I can manually inspect for columns with all zeros and find d0 and execute

cut -d "," -f 1,3- file> file_revised

The desired output is

header,d1,d2,d3, ... s1,5,2,8, ... s2,8,2,4, ... s3,7,3,4, ... s4,3,2,1, ... ...

But since I have so many columns, it is hard to inspect manually. How can I automatically remove columns with all zeros? Thank you.

$ cat file header,d0,d1,d2,d3 s1,0,5,2,8 s2,0,8,2,4 s3,0,7,3,4 s4,0,3,2,1 $ $ cat tst.awk NR==1 { for (i=1; i<=NF; ++i) a[i] next } NR==FNR { for (i in a) if ($i != "0") delete a[i] next } { sep = "" out = "" for (i=1; i<=NF; ++i) { if (i in a) continue out = out sep $i sep = FS } print out } $ $ awk -F, -f tst.awk file file header,d1,d2,d3 s1,5,2,8 s2,8,2,4 s3,7,3,4 s4,3,2,1

**remove rows with all zeros - MATLAB Answers,** shows this question is asked a lot Here's one of the more recent. http://www.mathworks.com/matlabcentral/answers/40018-delete-zeros-rows-and-columns In the Category list, click General to apply the default number format. To redisplay a date or a time, select the appropriate date or time format on the Number tab. Use a conditional format to hide zero values returned by a formula. Select the cell that contains the zero (0) value.

Here is one that gathers the fields to print to a variable (`p="$1,$3"`

... etc.) and uses `system`

to call awk to `print p`

:

$ awk ' BEGIN { FS=OFS="," } NR==1 { for(i=1;i<=NF;i++) # gather all field numbers to c[] c[i] next } { for(i in c) # test all fields that still are all zeros if($i!=0) delete c[i] } END { # after testing all the records for(i=1;i<=NF;i++) if(!(i in c)) p=p (p==""?"":OFS) "$" i # make list of list of fields to print p="print " p # p="print $1,$3,$4,$5,$6" system("awk \047BEGIN{FS=OFS=\",\"}{" cmd "}\047 " FILENAME) }' file

Output:

header,d1,d2,d3, ... s1,5,2,8, ... s2,8,2,4, ... s3,7,3,4, ... s4,3,2,1, ...

If all fields are all zeros, `p="print"`

and the whole file gets printed.

**delete zeros rows and columns - MATLAB Answers,** I try this code to delete all row and column with all zero values in them. It simply works for deleting the columns with all zero values abut it does not work for rows! Click OK, and all the rows with zero value have been hidden for this field, if you need to hide zero values in other fields, just repeat step2. And the zero value rows will be hidden from your selected fields.

Provided that the first column does not contain all zeros, this awk script should do the job

awk -F',' '(NR==FNR && NR >1){for(i = 1; i <= NF; i++) {a[i] = a[i]+$i}} (FNR!=NR){out=$1 for(i = 2; i<= NF; i++){ if(a[i]!=0){out=out","$i} } print out }' file_name file_name

Note that the sript takes the name of the input file file_name twice!

For example, for the input:

header,d0,d s1,0,5,2,8, s2,0,8,2,4, s3,0,7,3,4, s4,0,3,2,1,

the script yields as output

header,d s1,5,2,8 s2,8,2,4 s3,7,3,4 s4,3,2,1

**How can I remove the fields X which has all zero values? OR how ,** OR how do I show only fields with non-zero values? 0. This is may sample search and ample dataset:. To remove all columns that sum as zero: SelectVar[, colSums(selectVar) != 0] – Matthew Lundberg Aug 7 '17 at 22:28 1 @TheGoat That's the name of the data.frame in the question.

maybe you can use `sed`

command like below:

$ sed 's/\b0\,\b//g' test.txt header,d0,d1,d2,d3 s1,5,2,8 s2,8,2,4 s3,7,3,4 s4,3,2,1

**Eliminate all zeros and nulls,** Hi, How can I remove all zeros and nulls so that when I export my to eliminate zeros where Name2 is null under the four columns to the right The reason that ~any(data) takes less work than all(~data) is that ~data requires negating every element in data. Both any(x) and all(x) are able to terminate early; any(x) terminates as soon as it sees a nonzero and all(x) terminates as soon as it sees a zero.

Using Perl

> cat sumin.txt header,d0,d1,d2,d3 s1,0,5,2,8 s2,0,8,2,4 s3,0,7,3,4 s4,0,3,2,1 > cat rem_zero.sh perl -F, -lane ' @FH=@F if $.==1; if($.>1) { $F[$_] and $nz[$_]||=1 for 0..$#F; push(@L,[@F]); } END { @cols = grep $nz[$_], 0..$#nz; print join(",",@FH[@cols]); for my $line (@L) { print "@{$line}[@cols]" } } ' $1 > rem_zero.sh sumin.txt header,d1,d2,d3 s1 5 2 8 s2 8 2 4 s3 7 3 4 s4 3 2 1 >

**Solved: Automatically Remove all null Colums,** is there a way to remove automatically all this null columns and keep If you also wanted to remove any columns that had zeros, in addition to To remove the rows of 0, you can: sum the absolute value of each rows (to avoid having a zero sum from a mix of negative and positive numbers), which gives you a column vector of the row sums. keep the index of each line where the sum is non-zero. in code:

**Removing Zeros From a Field | GeoNet, The Esri Community,** Anyone remember how to remove zeros from in front of a number in a field. For example, I have 00012. I want 12. I forgot the formula in the Because the data are not equal zero exactly, we need set a threshold value for zero such as 1e-6, use numpy.all with axis=1 to check the rows are zeros or not. Use numpy.where and numpy.diff to get the split positions, and call numpy.split to split the array into a list of arrays.

**Remove fields / colums with zero "0" values in shapefile ,** The fields with the zero's will differ from project to project. So the model should look thru each field and if the field has zero's it must delete the field I found this bit of code on the Microsoft Community page that should work in the Field Calculator using VBScript: Assuming there is no space character in the data: Replace(LTRIM(Replace( fieldName, "0", " "))," ", "0") The part in bold replace all zeros by spaces, and then, left-trim that result, ie, remove starting spaces.

**Display or hide zero values - Excel - Office support,** In the box, type the value that you want to display in empty cells. To display blank cells, delete any characters in the box. To display zeros, clear the check box.

##### Comments

- Please add your desired output for that sample input to your question.
- And what you already tried yourself
- I see. I'll edit my post. Thank you!
- This will remove every cell containing a zero, except the ones in the last column. OP wants to delete columns that containing all zeros
- yes, if zero is also in the last column, then you can try
`sed 's/\b0,\b\|\b,0\b//g'`