The rate at which a thing occurs or is found.
The rate at which a thing occurs or is found.
Questions tagged [frequency]
2858 questions
8
votes
1 answer
linux perf record: difference between count (-c) and frequency (-F) options
I'm trying to understand what the -c and -F options of perf record really do but I cannot explain what I'm seeing. I'm running these commands:
perf record -a -F sleep 1
and
perf record -a -c sleep 1
trying different values of…
S. Rinco
- 123
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8
votes
4 answers
How to count the frequency of a string for each row in R
I have a .txt file that looks something like this:
rs1 NC AB NC
rs2 AB NC AA
rs3 NC NC NC
...
For each row, I would like to count the frequencies of "NC", so that my output will be something like below:
rs1 2
rs2 1
rs3 3
...
Can…
Renee
- 113
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- 5
8
votes
2 answers
elasticsearch disable term frequency scoring
I want to change the scoring system in elasticsearch to get rid of counting multiple appearances of a term. For example, I want:
"texas texas texas"
and
"texas"
to come out as the same score. I had found this mapping that elasticsearch said would…
Chadvador
- 167
- 2
- 9
8
votes
2 answers
Using table() to create 3 variable frequency table in R
I'm new to R and seeking some help. I understand the following problem is fairly simple and have looked for similar questions. None give quite the answer I'm looking for - any help would be appreciated.
The problem:
Producing a frequency table…
Alison Bennett
- 285
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8
votes
2 answers
Arduino - How to create two or more tones simultaneously on a piezo buzzer?
My high school electronics class decided to buy some arduino uno kits, which I must say are extremely cool. Enough about that, right now in the class we're experimenting with the piezo buzzer (it looks like this). We learned about creating songs…
Vishwa Iyer
- 841
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- 33
8
votes
2 answers
Getting frequency of sound on iPhone
I'm looking for an Objective-C class that allows me to get the frequency of a live input sound on the iPhone. Didn't find anything useful.
Before you ask: the frequency will not change for 0.1 seconds.
Thanks for answers,
Christian
cschwarz
- 1,195
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8
votes
2 answers
Counting unique pairs of categorical variables in R
If I have this data:
One <- c(rep("X",4),rep("Y",3),rep("Z",2))
Two <- c(rep("A",2),rep("B",6),rep("C",1))
df <- data.frame(One,Two)
One Two
1 X A
2 X A
3 X B
4 X B
5 Y B
6 Y B
7 Y B
8 Z B
9 Z C
I want to…
theamateurdataanalyst
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- 72
8
votes
3 answers
Creating a table with individual trials from a frequency table in R (inverse of table function)
I have a frequency table of data in a data.frame in R listing factor levels and counts of successes and failures. I would like to turn it from frequency table into a list of events - i.e. the opposite of the "table" command. Specifically, I would…
dan mackinlay
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8
votes
1 answer
Efficient algorithm to find most common phrases in a large volume of text
I am thinking about writing a program to collect for me the most common phrases in a large volume of the text. Had the problem been reduced to just finding words than that would be as simple as storing each new word in a hashmap and then increasing…
TheOne
- 10,819
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8
votes
7 answers
Sort the array in decreasing order of frequency of occurrence of elements in C
Question is to sort the array according to the frequency of the elements. For example, if the input array is
{ 2, 3, 2, 4, 5, 12, 2, 3, 3, 3, 12 }
then modify the array to:
{ 3, 3, 3, 3, 2, 2, 2, 12, 12, 4, 5 }
I wrote the code for this and…
Nit kt
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- 8
8
votes
4 answers
How can I implement the piano key frequency function in C#?
How can I implement the following function in C#?
Alon Gubkin
- 56,458
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- 195
- 288
8
votes
2 answers
Frequency counts in R
This may seem like a very basic R question, but I'd appreciate an answer. I have a data frame in the form of:
col1 col2
a g
a h
a g
b i
b g
b h
c i
I want to transform it into counts, so the outcome would be like this. I've tried…
aa762
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- 1
- 1
- 3
8
votes
2 answers
Get frequency wav audio using FFT and Complex class
It's been asked a lot, but I still stuck about implement FFT class on Android
I need to process my audio data using FFT...
I already read the almost same question here How can I get frequency data from PCM using FFT
and here How to get frequency…
raisa_
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- 28
8
votes
4 answers
Add column to dataframe that shows frequency of a variable
Say I have a dataframe like this:
location species
1 seattle A
2 buffalo C
3 seattle D
4 newark J
5 boston Q
I would like to append a column to this frame that shows the number of times a location appears in the data set, with…
thesnorlax
- 91
- 1
- 1
- 5
8
votes
6 answers
How to detect sound frequency / pitch on an iPhone?
I'm trying to find a way to detect sound frequency being recorded by iPhone's Microphone. I'd like to detect whether the sound frequency is going up or down.
Piotr Usewicz
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