frequency

问题 I'm trying to generate a wordcloud in R with the package wordcloud. That's the easy part, but it seems i'm lacking figuring out how to display the frequency next to the words that appear in the wordcloud. I've been searching everywhere but didn't find anything. Can anyone help me? The code i'm using is: wordcloud(Table$words, Table$freq, scale=c(2.5,0.5),m ax.words = 150, min.freq = 10, random.order=FALSE, rot.per=0.1, use.r.layout=FALSE, random.color = F, colors=rainbow) 回答1: Try something

问题 I want to transfer some string data from one android device to another using ultrasound waves. I tried this project but didn't work. android-ultrasound If anyone has sample code please share. 回答1: This is quite easy to do, but don't expect a high bit-rate. If it is a string then make sure it's not a long one (the longer the higher is the error probability ). Lets assume we're working with the vital part of the ASCII code, namely up to character number 127, then all you need is 7 bits per

问题 I am working on an application which has a large array containing lines of numbers, transNum[20000][200]//this is the 2d array containing the numbers and always keep track of the line numbers I am using a nested loop to look for the most frequent items. which is for(int i=0/*,lineitems=0*/;i<lineCounter;i++) { for(int j=0,shows=1;j<lineitem1[i];j++) { for(int t=i+1;t<lineCounter;t++) { for(int s=0;s<lineitem1[t];s++) { if(transNum[i][j]==transNum[t][s]) shows++; } } if(shows/lineCounter>=0.2)

问题 From a function that i run in matlab i get a 225x400 matrix. I want to count the frequency of each element in this matrix, meaning that i need to calculate how many times each elements appears on the the matrix. My matrix name is "Idiff" I am using: B=unique(Idiff); to find the unique elements in the Idiff matrix. I receive a column of 1138 elements, so i understand that these elements are unique and all the other elements in the Idiff matrix are these elements repeated. Now i try to count

问题 Please, see the the description of both fftshift and ifftshift . I would like to understand how to call the above two functions in relationship with fft and fftn in Matlab. Let say that my signal has a certain frequency content; now, the frequency array can generally be stored as: f = (-N/2:N/2-1)*df; f = (1:N)*(df/2); f = [(0:N/2-1) (-N/2:-1)]; What is the best way to call fft , coupled with fftshift and ifftshift , for the 3 study cases early mentioned? What is the effect on the standard

问题 So, I've been trying for some time now to find the best solution to calculate the fundamental frequency of a sample captured using AudioRecord in real-time. I have looked around some examples around here on SO: This one, and this one are the questions that helped me the most, but I still did not understand fully how they would work for finding the fundamental frequency. So what I am looking for is a more detailed explanation of what do I need to do to find the fundamental frequency having a

问题 Let's say we have a data set that reflects a series of binary signals--either "1" or "0" over some time period. The goal is to measure the consecutive instances of 1, and sum the total. So, for instance, if 1 occurred four times in a row, the cumulative signal would be 4 for the fourth time period. If the next period--the fifth period--was 0, the counter resets until/if the 1 signal returns. I'm looking for a way to record the equivalent of rolling frequencies of consecutive instances of 1s.

问题 I have a dataframe mydf , where the Left and Right genes are separated by ':'. I need to calculate the number of occurrence of these genes in LeftGene and RightGene columns per file and get something like in the result. What would be the best way to do it in R? sample LeftGene RightGene file1 ATT:TAA ATT:ATT ATT file2 TTP:TTG TTP:TTP Results file1 LeftGene RightGene ATT=3 ATT=1 TAA=1 file2 LeftGene RightGene TTP=1 TTP=2 TTG=1 Attn: akrun Here is the dput of actual data where we have file_name

问题 In this discussion, the result of fft is indices (0:N-1). fftshift simply converts that to [(N/2:N-1) (0:(N/2-1))]. I want to convert original range (O:N-1) to (t/N: t/N + 1), where t is time and assume integer and divisibel by N . I am using the Galois vectors as my datatype. Is this possible with built-in functions in Matlab? How can you achieve it in Matlab? 回答1: In general, given a data vector, if you want to shift the range from 0:N-1 to [a:N-1 0:a-1] for some a (0<=a<=N), you can do it

问题 A portion of an application that I am writing requires me to play a heart sound. When I play it using the source below, several problems arise. 1) It's not very loud, even when I set it to max volume 2) It doesn't sound right. It sounds like many of the frequencies have been cut off I got the heart sounds from this website: http://depts.washington.edu/physdx/heart/demo.html It is mp3 type of sound. When I play it on my computer, it's sounder perfect, even when I set it to a low volume. Can