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Is there a way to take a table of values and return a new table with only the rows that have data of a specified value?

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Tyler Johnson
Tyler Johnson on 1 Oct 2016
Answered: Image Analyst on 2 Oct 2016
For example, lets say I have a table that contains two rows:
1,2,3,4,5
5,6,7,8,9
Is there a way to, if given the number 4, return a new table with only the first row: 1,2,3,4,5 in it?

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Answers (2)

Walter Roberson
Walter Roberson on 2 Oct 2016
If you mean "array" instead of table() objects, then
YourArray( any(YourArray == 4, 2), :)

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Tyler Johnson
Tyler Johnson on 2 Oct 2016
I mean a table where a variable is assigned to each column and each row has equal length. Or is it only possible to extract columns at a time from this type of table?

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Image Analyst
Image Analyst on 2 Oct 2016
Here is one way:
% Create table variable
columnNames = {'Col1', 'Col2', 'Col3', 'Col4', 'Col5'}
t = table([1;5], [2;6], [3;7], [4;8], [5;9], 'VariableNames', columnNames)
% Scan rows keeping track of which rows have a 4 in them.
for row = 1 : size(t, 1)
rowsWith4(row) = any(t{row, :} == 4, 2);
end
% Extract only rows with 4 in them.
newTable = t(rowsWith4, :)
You'll see
t =
Col1 Col2 Col3 Col4 Col5
____ ____ ____ ____ ____
1 2 3 4 5
5 6 7 8 9
newTable =
Col1 Col2 Col3 Col4 Col5
____ ____ ____ ____ ____
1 2 3 4 5

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