03-01-2009
Local max values of a file
I have a data file of two columns (corresponding to the x and y axes of a graph) separated by a comma. I want to find the local maximum values and print them to a file. It has been a while since I've done any scripting and I've forgotten everything. I have a few basic questions.
1.) How do you read a file into a script? I know how to set a variable as a file and to access the file, I just can't recall how to make the file itself a variable to be read into the script.
2.) One a file is set to a specific variable name, how do I access a specific element? (i.e. row and column)
For instance, if I have a file 'data' with composed of the following:
12 23
15 49
19 22
20 12
34 39
45 1
60 56
89 79
I want a to make a file with
15 49
34 39
89 79
but I'm just having trouble remembering how to access the specific elements. i.e. the second column first element.
Any help or direction towards a good resource would be greatly appreciated. Thank you.
-John
Last edited by jemm; 03-01-2009 at 07:30 PM..
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LEARN ABOUT CENTOS
tabfunc
TABFUNC(1) General Commands Manual TABFUNC(1)
NAME
tabfunc - convert table to functions for rcalc, etc.
SYNOPSIS
tabfunc [ -i ] func1 [func2 ..]
DESCRIPTION
Tabfunc reads a table of numbers from the standard input and converts it to an expression suitable for icalc(1), rcalc(1) and their
cousins. The input must consist of a M x N matrix of real numbers, with exactly one row per line. The number of columns must always be
the same in each line, separated by whitespace and/or commas, with no missing values. The first column is always the independent variable,
whose value indexes all of the other elements. This value does not need to be evenly spaced, but it must be either monotonically increas-
ing or monotonically decreasing. (I.e. it cannot go up and then down, or down and then up.) Maximum input line width is 4096 characters
and the maximum number of data rows is 1024. Input lines not beginning with a numerical value will be silently ignored.
The command-line arguments given to tabfunc are the names to be assigned to each column. Tabfunc then produces a single function for each
column given. If there are some columns which should be skipped, the dummy name "0" may be given instead of a valid identifier. (It is
not necessary to specify a dummy name for extra columns at the end of the matrix.)
The -i option causes tabfunc to produce a description that will interpolate values in between those given for the independent variable on
the input.
EXAMPLE
To convert a small data table and feed it to rcalc for some calculation:
rcalc -e `tabfunc f1 f2 < table.dat` -f com.cal
AUTHOR
Greg Ward
SEE ALSO
cnt(1), icalc(1), neaten(1), rcalc(1), rlam(1), total(1)
RADIANCE
10/8/97 TABFUNC(1)