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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HISTO(1) General Commands Manual HISTO(1)
NAME
histo - compute 1-dimensional histogram of N data columns
SYNOPSIS
histo [-c][-p] xmin xmax nbins
histo [-c][-p] imin imax
DESCRIPTION
Histo bins columnular data on the standard input between the given minimum and maximum values. If three command line arguments are given,
the third is taken as the number of data bins between the first two real numbers. If only two arguments are given, they are both assumed
to be integers, and the number of data bins will be equal to their difference plus one. The bins are always of equal size.
The output is N+1 columns of data (for N columns input), where the first column is the centroid of each division, and each row corresponds
to the frequencies for each column around that value.
If the -c option is present, then histo computes the cumulative histogram for each column instead of the straight frequencies. The upper
value of each bin is printed also instead of the centroid. This may be useful in computing percentiles, for example. Values below the
minimum specified are still counted in the cumulative total.
The -p option tells histo to report the percentage of the total number of input lines rather than the absolute counts. In the case of a
cumulative total, this yields the percentile values directly. Values above the maximum are counted as well as values below in this case.
All input data is interpreted as real values, and columns must be white-space separated. If any value is less than the minimum or greater
than the maximum, it will be ignored unless the -c option is specified.
EXAMPLE
To count data values between -1 and 1 in 50 bins:
histo -1 1 50 < input.dat
To count frequencies of integers between 0 and 255:
histo 0 255 < input.dat
AUTHOR
Greg Ward
SEE ALSO
cnt(1), neaten(1), rcalc(1), rlam(1), tabfunc(1), total(1)
RADIANCE
9/6/96 HISTO(1)