That actually helps alot, as I had tried something like that. What I tried to do was:
That did not work, but by storing the weights in in an array, I see how it could be workable. My only question is how to store/use multiple values.
If $2 = Homework then $4 needs to be multiplied by 0.1
if $2 = Quiz then $4 needs to be multiplied by 0.4
if $2 = Lab then $4 needs to be multiplied by 0.3
if $2 = Final then $4 needs to be multiplied by 0.15
if $2 = Survey then $4 needs to be multiplied by 0.05
Then, all I would need to do is some $4 with the new values and have the overall percent for each student.
I want to find the top N entries for a certain field based on the values of another field.
For example if N=3, we want the 3 best values for each entry:
Entry1 ||| 100
Entry1 ||| 95
Entry1 ||| 30
Entry1 ||| 80
Entry1 ||| 50
Entry2 ||| 40
Entry2 ||| 20
Entry2 ||| 10
Entry2 ||| 50... (1 Reply)
So, I need to do some summing. I have an Apache log file with the following as a typical line:
127.0.0.1 - frank "GET /apache_pb.gif HTTP/1.0" 200 2326
Now, what I'd like to do is a per-minute sum. So, I can have awk tell me the individual minutes, preserving the dates(since this is a... (7 Replies)
Hi
i am new to scripting. i have a file file.dat with content as :
CONTENT_STORAGE PERCENTAGE FLAG:
/storage_01 64% 0
/storage_02 17% 1
I need to update the value of FLAG for a particular CONTENT_STORAGE value
I have written the following code
#!/bin/sh
threshold=20... (1 Reply)
Hi everybody,
I'm trying to replace the $98 field with "T" if the last field (108th) is T
I've tried
awk 'BEGIN{OFS=FS="|"} {if ($108=="T")sub($98,"T"); print}' test.txt
but that doesn't do anything
also tried
awk 'BEGIN{OFS=FS="|"}{ /*T.$/ sub($98,"T")} { print}' test.txt
but... (2 Replies)
I am trying to confirm the counts from another code and tried the below awk, but the syntax is incorrect. Basically, outputting the counts of each condition in $8. Thank you :)
awk '$8==/TYPE=snp/ /TYPE=ins/ /TYPE=del/ {count++} END{print count}'... (6 Replies)
In the tab-delimeted input file below I am trying to use awk to update the value in $2 if TYPE=ins in bold, by adding the value of
HRUN= in italics. In the below since in line 1 TYPE=ins the 117282541 value in $2 has 6 added because that is the value of HRUN=.
Hopefully the awk is a start but I... (2 Replies)
I am trying to output a tab-delimited result that uses the data from a tab-delimited file to combine and subtract specific lines.
If $4 matches in each line then the first matching sequential $6 value is added to $2, unless the value is 1, then the original $2 is used (like in the case of line... (3 Replies)
In the perl below, which does execute, I am having trouble with the else in Rule 3. The digit in f{8} is extracted and used to update f accordinly along with the value in f.
There can be either - * or + before the number that is extracted but the same logic applies, that is if the value is greater... (5 Replies)
In the awk below I am trying to copy the entire contents of $6 there may be multiple values seperated by a ;, to $8, if $8 is . (lines 1 and 3 are examples). If that condition $8 is not . (line2 is an example) then that line is skipped and printed as is. The awk does execute but prints the output... (3 Replies)
Request your help to change the field color based on condition , if it is otherthan 0. using html in unix.
Here is my condition
for(i=1;i<=NF;i++)
{
print "<td> "$i"</td>
}
Please use CODE tags when displaying sample input, output, and code segments. (17 Replies)
Discussion started by: CatchMe
17 Replies
LEARN ABOUT DEBIAN
rtf_filter
RTF_FILTER(3) rtfilter library RTF_FILTER(3)NAME
rtf_filter - filters a chunk of data
SYNOPSIS
#include <rtfilter.h>
unsigned int rtf_filter(hfilter filt, const void *x,
void *y, unsigned int ns);
DESCRIPTION
This function applies the filter referenced by filt on ns samples specified by the pointer x and writes the filtered data into the array
pointed by y. The arrays pointed by made of values whose correspond to the type specified at the creation of the filter. In addition, the
two arrays must not overlap (failing to comply will lead to undefined results).
Their number of elements have to be equal to ns multiplied by the number of channels processed (specified at the creation of the filter).
The arrays should be packed by channels with the following pattern:
|S1C1|S1C2|...|S1Ck|S2C1|S2C2|....|S2Ck|...|SnsCk|
where SiCj refers to the data value of the i-th sample and the j-th channel and k refers to the number of channel specified at the creation
of the filter.
RETURN VALUE
Returns the number of samples written in the array pointer by y. For most of the filters, this value will always be equal to ns. This is
however not the case of a downsampling filter whose the number of samples returned may vary from one call to another.
PERFORMANCE CONSIDERATION
On platforms that support SIMD instructions, rtf_filter() is implemented in 2 different versions: one normal and one using SIMD instruction
set which performs nearly 4x faster than the normal one when processing float data types. The SIMD version is automatically selected at
runtime if the following conditions are met (otherwise, the implementation falls back to the normal version):
- The input x and output y are aligned on 16 bytes boundary (128 bits)
- The sample strides (the size of the data type multiplied by the number of channel) of the input and output are multiples of 16 bytes.
The first condition is easily met by allocating x and y using memory allocation function mandating a certain alignment (for example,
posix_memalign(3) on POSIX platform).
The second condition is met if the number of channels is carefully chosen. Given the boost obtained with the SIMD version, it is often
interesting to add unused channels into the input and output (when possible) just to make the strides multiple of 16 bytes (for example
using always a multiple of 4 channels when dealing with float and real values).
SEE ALSO rtf_create_filter(3), rtf_init_filter(3)EPFL 2010 RTF_FILTER(3)