Reading a hex table with some undefined values
6 views (last 30 days)
Show older comments
I have a text table with hex values. Some of the values are of the form 0xXXXX. I'd like to read in the entire table as doubles with the 0xXXXX entries read as NaN. How do I do that?
3 Comments
Accepted Answer
Robert
on 10 Aug 2020
1 Comment
Walter Roberson
on 10 Aug 2020
If it was the "convert to double" that is the reason not to use the code I posted, then after my code use
varnames = data.Properties.VariableNames;
data = varfun(@double, data, ''); %changes variable names
data.Properties.VariableName = varnames;
More Answers (1)
Walter Roberson
on 10 Aug 2020
filename = 'hex.txt';
missingindication = {'0xXXXXX'};
data = readtable(filename, 'treatasmissing', missingindication, 'readvariable',false, 'delimiter', ' ', 'multi', true);
This code will work for up to 16 hex digits; any column that has a value 2^32 or larger will be returned as uint64 .
If the missing data indicator itself can have different numbers of X characters, then you can expand the cell array, such as
missingindication = arrayfun(@(c) ['0x', repmat('X', 1, c)], 1:32, 'uniform', 0);
0 Comments
See Also
Categories
Find more on Characters and Strings 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!