2D FFT using data from multiple CSV file

1 次查看（过去 30 天）
Manoj Manoj
Manoj Manoj 2022-11-16
评论： Manoj Manoj 2022-11-22
Hello,
I have data in 1008 csv files, each files has 3 column in it. I want to form a matrix using only the first column of each csv file as column vector of matrix, so that I have a matrix with 1008 columns and than do its 2D fft.
How can I form the matrix from csv files?

请先登录，再回答此问题。

采纳的回答

Nadia Shaik
Nadia Shaik 2022-11-21
Hi Manoj,
I understand that you have data in 1008 csv files and want to extract the first column of each csv file to a matrix.
You can use 'dir' function to read the name of all files with csv extensions and then iterate over the files using a 'for' loop.
To read data from csv files you can use 'readtable' function. To import specific column from the csv file, you can specify options and select the variable names using 'SelectedVariableNames'.
Refer the below link to know how to create import options object for a csv file.
https://in.mathworks.com/help/matlab/ref/readtable.html#bvghccx
After extracting data into a matrix, use the 'fft2' function to perform 2D FFT.
I hope this helps.
  3 个评论
显示 1更早的评论
Nadia Shaik
Nadia Shaik 2022-11-22
Hi Manoj,
I understand that you want to import only the variable "accel_x" from each file.
The reason for the error might be because of different column name. You can run the below code and check if the SelectedVariableNames gives “accel_x” as one of the outputs in the cell array.
opts = detectImportOptions('filename')
opts.SelectedVariableNames
I hope it helps.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

产品


版本

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by