XDF_ADD_EVENT(3) xdffileio library manual XDF_ADD_EVENT(3)NAME
xdf_add_event - Appends an event to the data file
SYNOPSIS
#include <xdfio.h>
int xdf_add_event(struct xdf* xdf, int evttype,
double onset, double dur);
DESCRIPTION
xdf_add_event() appends to the file referenced by the handle xdf opened for writing an event of type evttype at time onset lasting for a
duration dur expressed in seconds. If the event has no notion of duration, dur should be set to 0. evttype should be a value returned by a
successful call to xdf_add_evttype(3).
RETURN VALUE
xdf_add_event() returns 0 in case of success. Otherwise -1 is returned and errno is set appropriately.
ERRORS
EINVAL xdf is NULL or evttype has not been previously created by xdf_add_evttype(3)
ENOMEM The system is unable to allocate resources.
EPERM The file referenced by xdf has not been opened for writing or its file format does not support events.
SEE ALSO xdf_add_evttype(3)EPFL 2010 XDF_ADD_EVENT(3)
Check Out this Related Man Page
XDF_PREPARE_TRANSFER(3) xdffileio library manual XDF_PREPARE_TRANSFER(3)NAME
xdf_prepare_transfer - Setup the internals of the xDF file to be ready to receive or send data.
SYNOPSIS
#include <xdfio.h>
int xdf_prepare_transfer(struct xdf* xdf);
DESCRIPTION
xdf_prepare_transfer() set up the internal structures of the xDF file referenced by xdf to be ready to receive or send data. After a suc-
cessful call to it, you can call xdf_write(3) or xdf_read(3) depending of the mode of the xDF file.
Since this function prepares the transfer, no call to any function which configures it will be allowed anymore after xdf_define_arrays(3)
succeed. In particular, xdf_set_conf(3), xdf_setchconf(3) and xdf_define_arrays(3) will fail afterwards.
In case of failure due to I/O (file to big, connection to file system lost...), the best procedure is to close the file since the underly-
ing file will be in a undertermined stated.
RETURN VALUE
xdf_define_arrays() returns 0 in case of success. Otherwise -1 is returned and errno is set appropriately.
ERRORS
EINVAL xdf is NULL.
ENOMEM The system is unable to allocate memory resources.
EFBIG An attempt was made to write a file that exceeds the implementation-defined maximum file size or the process's file size limit, or
to write at a position past the maximum allowed offset.
EINTR The call was interrupted by a signal before any data was written; see signal(7).
EIO A low-level I/O error occurred while modifying the inode.
ENOSPC The device containing the xDF file has no room for the data.
ESTALE Stale file handle. This error can occur for NFS and for other file systems
SEE ALSO xdf_define_arrays(3), xdf_set_conf(3), xdf_set_chconf(3), xdf_read(3), xdf_write(3)EPFL 2010 XDF_PREPARE_TRANSFER(3)
I have a huge matrix file containing some 1.5 million rows and 6000 columns. The matrix looks something like this:
1 2 3
4 5 6
7 8 9
3 4 5
I want to add all the numbers in the columns of this matrix and display the result to my stdout. This means that the numbers in the first column are:
... (2 Replies)
Hi,
Just trying to get to grips with sed and awk for some reporting for work and I need some assistance:
I have a file that lists policy names on the first line and then on the second line whether the policy is active or not.
Policy Name: Policy1
Active: yes
Policy... (8 Replies)
version info :
vi availabe with RHEL 5.4
I have a text file with 10,000 lines. I want to copy lines from 5000th line to 7000th and redirect to a file. Any idea how I can do this?
Note:
The above scenario is just an example. In my actual requirement, the file has 14 million lines and I want... (9 Replies)
Hi everyone,
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
Hello,
I couldn't find an actual introduction thread, so I decided to just put this here.
I go by d0wngrade online. I have been programming in multiple languages for about 15+ years. I started with standard web design languages like HTML and CSS, but I then advanced from design to development... (2 Replies)
Hi guys...
The first active code line in AudioScope.sh is set -u .
This causes a complete exit if a variable is used/found but has not been allocated at the start of the program.
However, apart from writing code to do the task, is there a switch to to check which variables have been... (17 Replies)
Hi.
In thread https://www.unix.com/shell-programming-and-scripting/267833-grouping-counting.html rovf and I had a mini-discussion on grep and awk.
Here is a demo script that compares the awk and grep approaches for this single problem:
#!/usr/bin/env bash
# @(#) s2 Demonstrate group... (1 Reply)
Hello,
I have to fish out some specific columns from a file based on the header value. I have the list of columns I need in a different file. I thought I could read in the list of headers I need,
# file with header names of required columns in required order
headers_file=$2
# read contents... (11 Replies)
For those interested in installing dash shell on OSX Lion to help test POSIX compliancy of shell scripts, it is quite easy. I did it like this:
If you don't have gcc on your system:
0. Download and install the Command Line Tools for Xcode package from Sign In - Apple *
1. Download the dash... (2 Replies)
Hello and thanks in advance for any help anyone can offer me
I'm trying to learn the find command and thought I was understanding it... Apparently I was wrong. I was doing compound searches and I started getting weird results with the -size test. I was trying to do a search on a 1G file owned by... (14 Replies)
I have data of an excel files as given below,
file1
org1_1 1 1 2.5 100
org1_2 1 2 5.5 98
org1_3 1 3 7.2 88
file2
org2_1 1 1 2.5 100
org2_2 1 2 5.5 56
org2_3 1 3 7.2 70
I have multiple excel files as above shown.
I have to copy column 1, column 4 and paste into a new excel file as... (26 Replies)
Dear All,
Taking a break from Vue.js coding for the site, SEO and YT videos; and hopefully addressing some well deserved criticism from some here that I have been too focused on the visual aspects of the forums versus the substance and the community....
While the "current generation... (9 Replies)
Hi all...
Well guys and gals, I jumped in at the deep end and found things that PERL cannot do by default.
Many tricky terminal escape codes are not catered for so I had to create workarounds.
One thing I searched for was this:
Passing perl variable to shell command
AND, @Neo this was... (15 Replies)