How to replace all elements in a Table?

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For example, if I want to replace all -9999 with -999, I can do this in a matrix:
A(A==-9999) = -999;
My question is how to do this in a table that is generated by readtable?
A = readtable('test.xlsx');
When I tried, I got an error saying:
Operator '==' is not supported for operands of type 'table'.
Thank you.

Accepted Answer

Ameer Hamza
Ameer Hamza on 14 Mar 2020
Accessing the elements of the table are different as compared to the matrix. One solution is to convert the table to an array and then do the replacement. In the end, convert the array back to MATLAB: https://www.mathworks.com/matlabcentral/answers/450426-replacing-elements-in-a-table. You can make replacement without doing the conversion to the matrix as follow.
num_vars = size(T, 2);
for i=1:num_vars
T{:,i}(T{:,i}==-9999) = -999;
end
However, this will work as long as the class of every column in the table supports the comparison with double datatype using == operator.
  2 Comments
Leon
Leon on 14 Mar 2020
Many thanks!
I do have unknow number of columns that can be text strings. Is there an easy way to implement it in that case?
Ameer Hamza
Ameer Hamza on 14 Mar 2020
In that case, try this
for i=1:num_vars
if isa(T{:,i}, 'double')
T{:,i}(T{:,i}==1) = 100;
end
end

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