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
7
votes
1 answer
How to get CPU clock frequency on an ARM/Linux machine
The answer seems pretty obvious I guess but none of the possible answers given in https://superuser.com/questions/406141/how-to-get-an-arm-cpu-clock-speed-in-linux applies to me.
cat /proc/cpuinfo
only gives me
processor : 0
model name : ARMv7…
frans
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7
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Python plot frequency of fft.rfft
this is my first question here on stackoverflow and I hope I will not make huge mistakes.
I am analyzing a set of time series with sampling rate of 1 Hz. I need to plot their fourier transform in order to study their spectra.
Here it is my piece of…
basetta81
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7
votes
4 answers
frequency table with several variables in R
I am trying to replicate a table often used in official statistics but no success so far. Given a dataframe like this one:
d1 <- data.frame( StudentID = c("x1", "x10", "x2",
"x3", "x4", "x5", "x6", "x7", "x8", "x9"),
…
user1043144
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7
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4 answers
Intel MSR frequency scaling per - thread
I'm extending the Linux kernel in order to control the frequency of some threads: when they are scheduled onto a core (any core!), the core's frequency is changed by writing the proper p-state to the register IA32_PERF_CTL, as suggested in Intel's…
user1466329
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7
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4 answers
Find the N-th most frequent number in the array
Find the nth most frequent number in array.
(There is no limit on the range of the numbers)
I think we can
(i) store the occurence of every element using maps in C++
(ii) build a Max-heap in linear time of the occurences(or frequence) of element…
Luv
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6
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4 answers
Play stereo tone in android
Similar topics on this question include only playing tone in mono where the left and right frequencies are the same.
My question is: how to generate a stereo tone such that the left channel has a different frequency than the right channel?
I thought…
Neigyl R. Noval
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6
votes
1 answer
Python find audio frequency and amplitude over time
Here is what I would like to do. I would like to find the audio frequency and amplitude of a .wav file at every say 1ms of that .wav file and save it into a file. I have graphed frequency vs amplitude and have graphed amplitude over time but I…
Taylor
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6
votes
2 answers
"Error: Can't convert to character"
My student and I both loaded the same dataset, installed the same packages, and were running the same code. When I run "frq" I get a frequency table and the variable is labeled as "numeric." When my student runs the same code, she gets "Error: Can't…
mt646
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6
votes
4 answers
R: Count frequency of values in nested list with sub-elements
I have a nested list that contains country names.
I want to count the frequency of the countries, whereby +1 is added with each mention in a sub-list (regardless of how often the country is mentioned in that sub-list).
For instance, if I have this…
anpami
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readframes return 2 byte in python
When readframes() is used in python, the online documention says sampling frequency is returned it looks it returns 2 bytes. I think there are 4 byte on each frame:
left = 2 bytes
right = 2 bytes
Do I have to check if it is mono or stereo and if it…
kim taeyun
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6
votes
4 answers
How do I get count of number of items in selection?
I want to list in array format how many in each Diet group (there are four) have Time > 21.
I have tried to solve this in RStudio.
data(ChickWeight)
newdata <- subset(ChickWeight, Time >= 21, select=Diet)
In order to find how many observations are…
Metsfan
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6
votes
1 answer
Produce sounds of different frequencies in Swift
I want to make an app like this. This app is mosquito repellent app which produces sound of some frequency. I don't want it to limit to one sound. I want to generate and play sounds of different frequencies for different purposes. How can I do that…
Salman Khalid
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6
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1 answer
Python: Calculating frequency over time from a wav file in Python?
I am using scipy's wavfile library to read a wavfile.
rate, data = scipy.io.wavfile.read(filename)
This will return the rate and RAW data of the given wav filename.
What transformation on the data array do I need to do to go from RAW data to…
Eduardo Morales
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6
votes
4 answers
Counting frequency of words in documents using python regex
Created a python module which reads in a file, removes the stop words and outputs a python dictionary with the word and its frequency (How many times it occurred in the document).
def run():
filelist = os.listdir(path)
regex = re.compile(r'.*
jenniem001
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6
votes
1 answer
Android LiveData: Not receiving all notifications
I'm experimenting with Android's LiveData. I just tried to push a lot of notifications to an observer that observes a LiveData object. I let a thread run in background and in a while-loop i constantly push random values via LiveData's…
MarcWho
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