04-16-2009
Quote:
Originally Posted by
ajayh
Hi
I am very new to linux and scripting.
I need to replace numbers abc with number xyz inputting from a reference file.
I used the following command -
sed "s/$grd/$lab/" , where $grd and $lab comes from reference file.
The problem is the above line doesnt take care of space..
eg- 1546745 12344 123
if i need to replace 123 with 666 => grd = 123, lab = 666
following is the result -
1546745 66644 666
THe required result is - 1546745 12344 666
the script shud recognise spaceNumberspace and then replace only.
Any help wud be appreciated.
Thanks,
Aj
so in grd you are storing 123 byu stdin or what??
if not write grd=" 123" and lab=" 666" will solve your problem i guess
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LEARN ABOUT DEBIAN
grdtrend
GRDTREND(l) GRDTREND(l)
NAME
grdtrend - Fit and/or remove a polynomial trend in a grd file
SYNOPSIS
grdtrend grdfile -Nn_model[r] [ -Ddiff.grd ] [ -Ttrend.grd ] [ -V ] [ -Wweight.grd ]
DESCRIPTION
grdtrend reads a 2-D gridded file and fits a low-order polynomial trend to these data by [optionally weighted] least-squares. The trend
surface is defined by:
m1 + m2*x + m3*y + m4*x*y + m5*x*x + m6*y*y + m7*x*x*x + m8*x*x*y + m9*x*y*y + m10*y*y*y.
The user must specify -Nn_model, the number of model parameters to use; thus, -N4 fits a bilinear trend, -N6 a quadratic surface, and so
on. Optionally, append r to the -N option to perform a robust fit. In this case, the program will iteratively reweight the data based on a
robust scale estimate, in order to converge to a solution insensitive to outliers. This may be handy when separating a "regional" field
from a "residual" which should have non-zero mean, such as a local mountain on a regional surface.
If data file has values set to NaN, these will be ignored during fitting; if output files are written, these will also have NaN in the same
locations.
No space between the option flag and the associated arguments.
grdfile
The name of a 2-D binary grd file.
-N [r]n_model sets the number of model parameters to fit. Prepend r for robust fit.
OPTIONS
No space between the option flag and the associated arguments.
-D Write the difference (input data - trend) to the file diff.grd.
-T Write the fitted trend to the file trend.grd.
-V Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
-W If weight.grd exists, it will be read and used to solve a weighted least-squares problem. [Default: Ordinary least-squares fit.] If
the robust option has been selected, the weights used in the robust fit will be written to weight.grd.
REMARKS
The domain of x and y will be shifted and scaled to [-1, 1] and the basis functions are built from Legendre polynomials. These have a
numerical advantage in the form of the matrix which must be inverted and allow more accurate solutions. NOTE: The model parameters listed
with -V are Legendre polynomial coefficients; they are not numerically equivalent to the m#s in the equation described above. The descrip-
tion above is to allow the user to match -N with the order of the polynomial surface.
EXAMPLES
To remove a planar trend from hawaii_topo.grd and write result in hawaii_residual.grd, try
grdtrend hawaii_topo.grd -N3 -Dhawaii_residual.grd
To do a robust fit of a bicubic surface to hawaii_topo.grd, writing the result in hawaii_trend.grd and the weights used in
hawaii_weight.grd, and reporting the progress, try
grdtrend hawaii_topo.grd -Nr10 -Thawaii_trend.grd -Whawaii_weight.grd -V
SEE ALSO
gmt(1gmt), grdfft(1gmt), grdfilter(1gmt)
1 Jan 2004 GRDTREND(l)