Convert Table to double vector

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Frank Oosterveld
Frank Oosterveld 2020-10-1
评论： Charlie Haimbaugh 2022-2-28
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?

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-10-1
编辑：Ameer Hamza 2020-10-1
First, convert to string and then convert to numeric values.
v = categorical([1e-4 1e-6]);
x = arrayfun(@(x) str2double(x), string(v));
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Charlie Haimbaugh
Charlie Haimbaugh 2022-2-28
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?

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更多回答（1 个）

Campion Loong
Campion Loong 2020-10-9
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

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