10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Input file:
bv|111259484|pir||T49736_real_data
bv|159484|pir||T9736_data_figure
bv|113584|prf|T4736|truth
bv|113584|pir||T4736_truth
Desired output:
bv|111259484|pir|T49736|real_data
bv|159484|pir|T9736|data_figure
bv|113584|prf|T4736|truth
bv|113584|pir|T4736|truth
Once the... (8 Replies)
Discussion started by: perl_beginner
8 Replies
2. Shell Programming and Scripting
I am working with an undocumented feature of a software product (BladeLogic). It is returning the below string in response to a query. It is enclosed with square brackets, "records" are separated with commas and "fields" separated with semicolons. My thought was that this might be some basic... (1 Reply)
Discussion started by: dshcs
1 Replies
3. Programming
Hello,
Over the past few years, I've conducted some rather thorough R&D in the field of lexicon-data-structure optimization.
A Trie is a good place to start, followed by a traditional DAWG.
Smaller means faster, but a traditional DAWG encoding operates as a Boolean-graph, unable to index... (1 Reply)
Discussion started by: HeavyJ
1 Replies
4. Shell Programming and Scripting
Hi All,
I want to create a data structure like this
$VAR1 = {
'testsuite' => {
'DHCP' => {
'failures' => '0',
'errors' => '0',
'time' =>... (3 Replies)
Discussion started by: Damon_Qu
3 Replies
5. Shell Programming and Scripting
I have the perl data structure and what i need to do is find all values in
@{$extractColumns{'2'}{'D'}} which are not there in @{$extractColumns{'2'}{'M'}} but seems like i need to put a flag somewhere and i messed up
foreach my $order (keys %extractColumns)
{
foreach my $value... (2 Replies)
Discussion started by: dinjo_jo
2 Replies
6. Programming
Dear All,
I would appreciate if some one could please post a few examples using GDSL library. The library provides general data structure operations.
I am having confusion using list data structure regarding arguments.
Would appreciate your kind response.
with regards,
Usman (2 Replies)
Discussion started by: usman_minhas
2 Replies
7. Programming
hello guys,
i'm required to modify the process scheduling part of the freebsd kernel as part of our homework.
the homework needs us add a new variable to the process data structure, and the priority of the process will be having something to do with the variable.
to adjust the variable... (2 Replies)
Discussion started by: billconan
2 Replies
8. Shell Programming and Scripting
Hello,
I have a file of the following information ( first field parent item, second field child item)
PM01 PM02
PM01 PM1A
PM02 PM03
PM03 PM04
PM03 PM05
PM03 PM06
PM05 PM10
PM1A PM2A
PM2A PM3B
PM2A PM3C
The output should be like this :
PM01 PM02 PM03 PM04
... (2 Replies)
Discussion started by: ThobiasVakayil
2 Replies
9. Programming
I have heard about on-disk data structures, but I am trying to understand how to implement it.
I want to write a program which is going to make use of a B-Tree which is so huge that whole of it cannot sit in memory.
Lets take a simple case of a linked list. Suppose I want to have a linked... (1 Reply)
Discussion started by: the_learner
1 Replies
10. Filesystems, Disks and Memory
the superblock has the offset for inode table.
My question is
1) whether it starts relative to the start of the first cylinder group
or is it relative to the start of filesystem???
2)and also which entry corresponds to the root(/) inode?? is it second or third entry???
My questions are... (4 Replies)
Discussion started by: anwerreyaz
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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)