awk replace cells with NaN/delete if condition


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# 1  
Question awk replace cells with NaN/delete if condition

Hello, I will like to delete/replace $3 with NaN. condition $3>-2000 (file1.dat) to produce out.dat. I want to retain the structure of the table. I use this code, this output only $3. Any idea on how to modify this code. Thank you.

Code:
awk -v OFS='' '{for(i=1; i<=NF; i++) if ($i > -2000 || $i ==" > -2000 ")$i = NaN }1' file1.xyz > out.xyz

Code:
file1.dat
2181.0640997 2898.54726885 -4682.91259766
2182.06412909 2898.54726885 -2683.671875
2183.06415848 2898.54726885 -684.24609375
2184.06418787 2898.54726885 -1684.00146484
2185.06421726 2898.54726885 -2682.8671875
2186.06424665 2898.54726885 -4080.03369141
2187.06427604 2898.54726885 -1675.8359375
2188.06430543 2898.54726885 -3671.14892578
2189.06433482 2898.54726885 -6666.21142578
2190.06436421 2898.54726885 -1661.75146484
2191.0643936 2898.54726885 -4657.61230469
2192.06442299 2898.54726885 -1653.79052734
2193.06445238 2898.54726885 -5650.45507813
2194.06448177 2898.54726885 -4647.76513672
2195.06451116 2898.54726885 -1645.11816406
2196.06454055 2898.54726885 -6642.38427734

out1.dat
2181.0640997 2898.54726885 -4682.91259766
2182.06412909 2898.54726885 -2683.671875
2183.06415848 2898.54726885 -684.24609375
2184.06418787 2898.54726885 NaN
2185.06421726 2898.54726885 -2682.8671875
2186.06424665 2898.54726885 -4080.03369141
2187.06427604 2898.54726885 NaN
2188.06430543 2898.54726885 -3671.14892578
2189.06433482 2898.54726885 -6666.21142578
2190.06436421 2898.54726885 NaN
2191.0643936 2898.54726885 -4657.61230469
2192.06442299 2898.54726885 NaN
2193.06445238 2898.54726885 -5650.45507813
2194.06448177 2898.54726885 -4647.76513672
2195.06451116 2898.54726885 NaN
2196.06454055 2898.54726885 -6642.38427734

# 2  
What do you mean by "I want to retain the structure of the table"?
Why do you run the for loop across all fields if you want to operate on $3 only?
What are the two ored branches in the if construct for?
Why is line 3 not NaNned?
This User Gave Thanks to RudiC For This Post:
# 3  
Question

Thanks RudiC, I could just remove the fields with values above -2000, but I want to remain the structure such that I have a 4x4 matrix. then perform calculations only on the remaining values.
I made several attempts to operate only on $3, but couldn't so I decided to try another way, since $1 and $2 can't be affected by the condition (>-2000).

---------- Post updated at 03:35 PM ---------- Previous update was at 03:32 PM ----------

I also considered print $3, so I can apply the condition to it separately, but the whole fields are deleted and could not fit the 4x4 structure I intend to retain.
# 4  
Code:
awk '$3 >= -2000 {$3="NaN"}1' myFile

This User Gave Thanks to vgersh99 For This Post:
# 5  
Quote:
Originally Posted by geomarine
Thanks RudiC, I could just remove the fields with values above -2000, but I want to remain the structure such that I have a 4x4 matrix. then perform calculations only on the remaining values.
I made several attempts to operate only on $3, but couldn't so I decided to try another way, since $1 and $2 can't be affected by the condition (>-2000).

---------- Post updated at 03:35 PM ---------- Previous update was at 03:32 PM ----------

I also considered print $3, so I can apply the condition to it separately, but the whole fields are deleted and could not fit the 4x4 structure I intend to retain.

Help me out - what 4x4- matrix are you talking of? I see a 3 fields file n lines long. If you need to convert that to another matrix, post the rules / logics to be applied and people in here might be able to help.
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