Transform column data to m x n matrix
6 views (last 30 days)
Show older comments
Hi, I have 3 column data and want to transform it into an m x n matrix. Please see the attached file for an example.
0 Comments
Accepted Answer
Andrei Bobrov
on 18 Oct 2018
OriginalData = readtable('Path_to_your_file\DataTransformation.xlsx',...
'Range','A3:C26',...
'ReadVariableNames',true);
[gr,G] = findgroups(OriginalData.Key2);
A = accumarray([gr,(1:numel(gr))'],OriginalData.values);
TransformedData = [[{nan};G],num2cell([OriginalData.Key1';A])];
More Answers (3)
Kevin Chng
on 17 Oct 2018
Edited: Kevin Chng
on 17 Oct 2018
Hi
The best solution is :
Drag your excel and drop it in MATLAB command window.
It will pop out a app for you to configure your excel input.
Since there are char in 2nd column, therefore I stored them in table data type instead of matrix.
opts = spreadsheetImportOptions("NumVariables", 3);
opts.Sheet = "Sheet1";
opts.DataRange = "A4:C29";
opts.VariableNames = ["Key1", "Key2", "values"];
opts.VariableTypes = ["double", "categorical", "double"];
opts = setvaropts(opts, 2, "EmptyFieldRule", "auto");
DataTransformation = readtable("DataTransformation.xlsx", opts, "UseExcel", false);
clear opts
Code above is generated through the application.
However, I saw there are other data or table in your excel sheet, if you want to import them in other table, just repeat the method what i say : Drag the excel sheet and drop it in MATLAB command window, select the range and data type you wanted to export them.
2 Comments
Kevin Chng
on 18 Oct 2018
Read table from Original Data, then write it to Transformed Data according to its pattern?
madhan ravi
on 18 Oct 2018
Edited: madhan ravi
on 18 Oct 2018
[num,txt,raw]=xlsread('DataTransformation.xlsx')
[m,n]=size(num)
num(isnan(num))=[]
data=reshape(num,m,n) %m and n can be your choice but make sure m times n == number(num)
3 Comments
See Also
Categories
Find more on Tables in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!