Editing Guide to madagascar programs (section)

==sfpad==
{| class="wikitable" align="center" cellspacing="0" border="1"
! colspan="4" style="background:#ffdead;" | Pad a dataset with zeros.
|-
! colspan="4" | sfpad < in.rsf > out.rsf beg#=0 end#=0 n#=
|-
|  colspan="4" | <br>n#out is equivalent to n#, both of them overwrite end#.<br><br>Other parameters from the command line are passed to the output (similar to sfput).
|-
| ''int    '' || '''beg#=0''' ||   || 	the number of zeros to add before the beginning of #-th axis
|-
| ''int    '' || '''end#=0''' ||   || 	the number of zeros to add after the end of #-th axis
|-
| ''int    '' || '''n#=''' ||   || 	the output length of #-th axis - padding at the end
|}

<tt>sfpad</tt> increases the dimensions of the input dataset by padding
the data with zeroes. Here are some simple examples.
<pre>
bash$ sfspike n1=5 n2=3 > one.rsf
bash$ sfdisfil < one.rsf
   0:             1            1            1            1            1
   5:             1            1            1            1            1
  10:             1            1            1            1            1
bash$ < one.rsf sfpad n2=5 | sfdisfil
   0:             1            1            1            1            1
   5:             1            1            1            1            1
  10:             1            1            1            1            1
  15:             0            0            0            0            0
  20:             0            0            0            0            0
bash$ < one.rsf sfpad beg2=2 | sfdisfil
   0:             0            0            0            0            0
   5:             0            0            0            0            0
  10:             1            1            1            1            1
  15:             1            1            1            1            1
  20:             1            1            1            1            1
bash$ < one.rsf sfpad beg2=1 end2=1 | sfdisfil
   0:             0            0            0            0            0
   5:             1            1            1            1            1
  10:             1            1            1            1            1
  15:             1            1            1            1            1
  20:             0            0            0            0            0
bash$ < one.rsf sfwindow n1=3 | sfpad n1=5 n2=5 beg1=1 beg2=1 | sfdisfil
   0:             0            0            0            0            0
   5:             0            1            1            1            0
  10:             0            1            1            1            0
  15:             0            1            1            1            0
  20:             0            0            0            0            0
</pre>
You can use <tt>sfcat</tt> to pad data with values other than zeroes.