How to change data type of table in matlab

I am reading a spreadsheet with 2 columns using readtable command in Matlab. Both columns of the table are read as a string. How two change the datatype of a second column to double.

[Stephen23]

"How two change the datatype of a second column to double."

Most likely if the data could be imported as numeric then it already would be... what kind of values are in those columns?

If you can, please upload the spreadsheet by clicking the paperclip button.

[Iram Shahzadi]

Thank you for help. Here is the sheet. The first variable is path to Image and second variable 'patient' is some specific location in Image. I want the location to be imported as [1*4 double].

Answer 1

[Guillaume]

Really, you should change the way you store your data in the spreadsheet. As it is you're losing most of the benefit of the spreadsheet format. Even in excel, you wouldn't be able to use those numbers as they're stored as text.

One of the many ways of extracting the numbers from the text:

t = readtable('book1.xlsx');
t.patient = cellfun(@str2double, regexp(t.patient, '\d+', 'match'), 'UniformOutput', false)

If you didn't have those brackets [] around the text and the numbers had beens separated by spaces, it would have been easier.

[Iram Shahzadi]

Thanks a lot. it worked for me :)

Answer 2

[madhan ravi]

https://www.mathworks.com/matlabcentral/answers/347783-change-table-variable-data-type#answer_273279

[Iram Shahzadi]

I want to change the second variable to double type. I used str2double but all entries under the second variable changed to NaN. Here is what i used

T = readtable('Book1.xlsx') variableNames = T.Properties.VariableNames; T.(variableNames{2}) = str2double(T.(variableNames{2}));