Transform column data to m x n matrix
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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.
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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)
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