FAQ Database Discussion Community


Resampling and merging data frame with python

python,csv,pandas,resampling,merging-data
Hi I have created a dictionary of dataFrame with this code import os import pandas import glob path="G:\my_dir\*" dataList={} for files in glob.glob(path): dataList[files]=(read_csv(files,sep=";",index_col='Date')) The different dataframe present in the dictory have different time sample. An example of dataFrame(A) is Date Volume Value 2014-01-04 06:00:02 6062 108000.0 2014-01-04 06:06:05 6062...

MFT NAudio Resampling on the fly

naudio,ms-media-foundation,resampling
I want to resample an audio file using NAudio and MFT on-the-fly. For example, I have the following audio file: File name: MyAudioFile.mp3 Duration: 10 sec When this file is being played, I only want to resample that particular position to WAV in the desired format. So, if the length...

how to find the correct sampling rate for interp1 in Matlab

matlab,resampling,downsampling
i am trying to find the correct sampling rate for interp1 (or decimate or resample) for plotting a number of points in axes obtained by imfreehand.. First i plot something (anything not sine specific) bands=1:20;plot(bands,sin(bands)); hax=gca; Then draw something with imfreehand on the axis like this: imfreehand('Closed',0); I extract the...

Pandas: Aggregate by month for every subgroup

python,pandas,resampling
I have the following pandas table TUFNWGTP TELFS t070101 t070102 t070103 t070104 \ TUDIARYDATE status 2003-01-03 emp 8155462.672158 2 0 0 0 0 2003-01-04 emp 1735322.527819 1 0 0 0 0 emp 3830527.482672 2 60 0 0 0 2003-01-02 unemp 6622022.995205 4 0 0 0 0 2003-01-09 emp 3068387.344956 1...

Cesium Resampling

zooming,resampling,cesium
I know that Cesium offers several different interpolation methods, including linear (or bilinear in 2D), Hermite, and Lagrange. One can use these methods to resample sets of points and/or create curves that approximate sampled points, etc. However, the question I have is what method does Cesium use internally when it...

Resampling WasapiLoopbackCapture

c#,signal-processing,naudio,resampling
I'm trying to resample the WasapiLoopbackCapture's output from my soundcards 44100Hz, 16bit, 2 channel waveformat to a 16000Hz, 16bit, 1 channel format for later use in a System.Net.Sockets.NetworkStream (I want to write the converted bytes to the network stream) But I have no idea how to start even! I'm really...

Array undersampling Python

python,arrays,resampling
I have many arrays of different length and what I want to do is to have for those arrays a fixed length, let's say 100 samples. These arrays contain time series and I do not want to lose the shape of those series while reducing the size of the array....

Pandas resample by first day in my data

python,pandas,dataframes,resampling
I have a Yahoo finance daily stock price imported in a pandas dataframe. I want to use .resample() to convert it to the monthly stock price by taking the price of the first QUOTED daily price of each month. .resample('MS', how='first') returns the correct price of each month but it...

Sample 5 times and sum, with replacement

r,for-loop,sum,resampling
I am trying to sample with replacement with a slight twist. I want to sample a list, vector, etc... 5 times and sum that. And replace the 5 sampled values, and do this 1000 times. x<- 1:1000 samp <- matrix(NA, ncol = 1, nrow = 1000) for(i in length(x)){ samp[i,]...