Hi I was hoping that maybe someone could help me with a small piece of C code. I have a number of files, which are all of similar layout ie. three lines of text and 5-6 columns of numerical data. I need to add each of the elements of the second column in one file to their counterparts in the second... (17 Replies)
Hi,
How can I remove all non numerical data from line, so I don't want to delete the line but to have only the numbers.
e.g.:
#########
123
aaa124
125bbb
126
127
#########
So I want all the leading and trailing non numerical stuff(letters/white space/tabs anything else except... (10 Replies)
Hi All,
I have a .csv file with 3 columns called nLats, nLongs, and fRes. in following format :
"nLats","nLongs","fRes"
0,0,-1
0,1,-1
0,2,-1
0,3,-1
0,4,-1
.........
.........
0,143,-1 nLats increments at nLongs=143
1,0, -1
1,1, -1
..........
..........
1,143,-1... (1 Reply)
Hi,
I've searched and couldn't find anyone else with this problem. Is there anyway (preferably using ksh - but other script languages would do) that I can read in binary float data into a text file. The data (arrays from various stages of radar processing) comes in various formats, but mainly... (3 Replies)
I have a column of numbers in the following format:
1.722e-05
2.018e-05
2.548e-05
2.747e-05
7.897e-05
4.016e-05
4.613e-05
4.613e-05
5.151e-05
5.151e-05
5.151e-05
6.1e-05
6.254e-05
7.04e-05
7.12e-05
7.12e-05 (6 Replies)
Hi
I have a file as below
<field1> <field2> <field3> ... <field_num1> <field_num2>
Trying to sort based on difference of <field_num1> and <field_num2> in desceding order and print all fields.
I tried this and it doesn't sort on the difference field .. Appreciate your help.
cat... (9 Replies)
How to sort the following output based on lowest to highest BE?
The following sort does not work.
$ sort -t. -k1,1n -k2,2n bfd.txt
BE31.116 0s 0s DOWN DAMP
BE31.116 0s 0s DOWN DAMP
BE31.117 0s 0s ... (7 Replies)
I have a string of pre defined ip address list which will always remain constant their order will never change like in below sample:
iplist=8.8.5.19,9.7.5.14,12.9.9.23,8.8.8.14,144.1.113
In the above example i m considering only 5 ips but there could be many more.
Now i have a file which... (15 Replies)
Discussion started by: mohtashims
15 Replies
LEARN ABOUT PHP
strpos
STRPOS(3) 1 STRPOS(3)strpos - Find the position of the first occurrence of a substring in a stringSYNOPSIS
mixed strpos (string $haystack, mixed $needle, [int $offset])
DESCRIPTION
Find the numeric position of the first occurrence of $needle in the $haystack string.
PARAMETERS
o $haystack
- The string to search in.
o $needle
- If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
o $offset
- If specified, search will start this number of characters counted from the beginning of the string. Unlike strrpos(3) and strri-
pos(3), the offset cannot be negative.
RETURN VALUES
Returns the position of where the needle exists relative to the beginning of the $haystack string (independent of offset). Also note that
string positions start at 0, and not 1.
Returns FALSE if the needle was not found.
Warning
This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
Booleans for more information. Use the === operator for testing the return value of this function.
EXAMPLES
Example #1
Using ===
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
?>
Example #2
Using !==
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// The !== operator can also be used. Using != would not work as expected
// because the position of 'a' is 0. The statement (0 != false) evaluates
// to false.
if ($pos !== false) {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
} else {
echo "The string '$findme' was not found in the string '$mystring'";
}
?>
Example #3
Using an offset
<?php
// We can search for the character, ignoring anything before the offset
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
?>
NOTES
Note
This function is binary-safe.
SEE ALSO stripos(3), strrpos(3), strripos(3), strstr(3), strpbrk(3), substr(3), preg_match(3).
PHP Documentation Group STRPOS(3)