frequency

I have a dataframe : df = pd.DataFrame({'Type' : ['Pokemon', 'Pokemon', 'Bird', 'Pokemon', 'Bird', 'Pokemon', 'Pokemon', 'Bird'],'Name' : ['Jerry', 'Jerry', 'Flappy Bird', 'Mudkip','Pigeon', 'Mudkip', 'Jerry', 'Pigeon']}) and i need to group the observations w.r.t their types i.e all pokemon types together with their respective names . And i need to add another column which has the frequency of occurrence of the names in the types. It should look like : Type Name Frequency Pokemon Jerry 3 Mudkip 2 Bird Pigeon 2 Flappy Bird 1 I used : data2 = df.groupby(['Type']) but that doesn't group it the

I'm trying to detect voice throught input from the microphone in real-time. I allready receive the input, execute FFT algorithm and have the result in dB. I have a frequency domain, a time domain and a spectogram. How can I get the fundamental frequency? If I get the fundamental frequency can I specify that if the frequency is between certain values, then it is voice that we are talking? Is there any other way to do this with the things that I allready have? Tks in advance There are many different algorithms for frequency estimation , and the right one to use depends on what you're doing. What

I have a method that takes in a String parameter, and uses NLTK to break the String down to sentences, then into words. Afterwards, it converts each word into lowercase, and finally creates a dictionary of the frequency of each word. import nltk from collections import Counter def freq(string): f = Counter() sentence_list = nltk.tokenize.sent_tokenize(string) for sentence in sentence_list: words = nltk.word_tokenize(sentence) words = [word.lower() for word in words] for word in words: f[word] += 1 return f I'm supposed to optimize the above code further to result in faster preprocessing time,

I'm a new to software development on Android. I want to make an application like SetCPU that can manipulate CPU frequency in Android. But I couldn't find some related APIs or materials. I want to know following two things sincerely. Are there APIs to change the CPU frequency in Android? If not, are there some APIs in Linux? Sidartha Carvalho Some commands in ADB Set Governor: adb shell echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor Set Frequency in KHz: adb shell su -c "echo "702000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed" //min frequency adb shell su

I am trying to find out the frequency of appearance of every letter in the english alphabet in an input file. How can I do this in a bash script? Just one awk command awk -vFS="" '{for(i=1;i<=NF;i++)w[$i]++}END{for(i in w) print i,w[i]}' file if you want case insensitive, add tolower() awk -vFS="" '{for(i=1;i<=NF;i++)w[tolower($i)]++}END{for(i in w) print i,w[i]}' file and if you want only characters, awk -vFS="" '{for(i=1;i<=NF;i++){ if($i~/[a-zA-Z]/) { w[tolower($i)]++} } }END{for(i in w) print i,w[i]}' file and if you want only digits, change /[a-zA-Z]/ to /[0-9]/ if you do not want to show