10-07-2010
Calculate difference between consecutive data points in a column from a file
Hi,
I have a file with one column data (sample below) and I am trying to write a shell script to calculate the difference between consecutive data valuse i.e
Var = Ni -N(i-1)
0.3141
-3.6595
0.9171
5.2001
3.5331
3.7022
-6.1087
-5.1039
-9.8144
1.6516
-2.725
3.982
7.769
8.88
8.392
2.188
3.13
I seen not to even know where to start from and so I really need some a lot of help please
Thank you
Malandisa
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LEARN ABOUT DEBIAN
sample
SAMPLE(3alleg4) Allegro manual SAMPLE(3alleg4)
NAME
SAMPLE - Stores sound data. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
typedef struct SAMPLE
DESCRIPTION
int bits; - 8 or 16
int stereo; - sample type flag
int freq; - sample frequency
int priority; - 0-255
unsigned long len; - length (in samples)
unsigned long loop_start; - loop start position
unsigned long loop_end; - loop finish position
void *data; - raw sample data
A sample structure, which holds sound data, used by the digital sample routines. You can consider all of these fields as read only except
priority, loop_start and loop_end, which you can change them for example after loading a sample from disk.
The priority is a value from 0 to 255 (by default set to 128) and controls how hardware voices on the sound card are allocated if you
attempt to play more than the driver can handle. This may be used to ensure that the less important sounds are cut off while the important
ones are preserved.
The variables loop_start and loop_end specify the loop position in sample units, and are set by default to the start and end of the sample.
If you are creating your own samples on the fly, you might also want to modify the raw data of the sample pointed by the data field. The
sample data are always in unsigned format. This means that if you are loading a PCM encoded sound file with signed 16-bit samples, you
would have to XOR every two bytes (i.e. every sample value) with 0x8000 to change the signedness.
SEE ALSO
load_sample(3alleg4), exsample(3alleg4)
Allegro version 4.4.2 SAMPLE(3alleg4)