Convert Table to double vector

Good morning

I try to import values from a file, matlab makes a table file from it.

Now I want to use the table values as doubles, such that I can work with it numerically.

I tried

A = table2array(Displacment_u1_u2)

But then I finish up with

A = 

  1×2 categorical array

     -4.5031370E-03      -1.1870213E-01 

These values are still not manipulatable.

When I then try

double(A)

I get the values from the 'baskets' they're in,

ans =

     1     2

Thus, how do i get the categorical arrays as double values such that I can work with them?

[Stephen23]

https://www.mathworks.com/matlabcentral/answers/264383-convert-categorical-to-numeric#answer_311566

Answer 1

[Ameer Hamza]

First, convert to string and then convert to numeric values.

v = categorical([1e-4 1e-6]);
x = arrayfun(@(x) str2double(x), string(v));

[Frank Oosterveld]

works! thanks!

[Ameer Hamza]

I am glad to be of help!

[Charlie Haimbaugh]

I have issues with str2double and str2num in term of precision. I am trying to convert string gps coordinates from an imported table to numbers, but it brings precision down to 4 decimals. Is there any way around this?

Answer 2

[Campion Loong]

Hi Ameer,

If you have R2019a and newer, you can try using readmatrix to directly read the file as numeric:

https://www.mathworks.com/help/matlab/ref/readmatrix.html