istable() returns false for my table

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Gavin
Gavin 2025-7-15
评论： Steven Lord 2025-7-16
I create a table under certain conditions, later want to check if it is a table yet.
Checking in the command window I get this
K>> (app.Results2Table)
ans =
Columns 1 through 5
643705 644260 644760 645000 0
646934 647489 647989 648229 0
650201 0 0 0 0
K>> istable(app.Results2Table)
ans =
logical
0
Looks like a table to me

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采纳的回答

Les Beckham
Les Beckham 2025-7-15
移动：Walter Roberson 2025-7-15
That is definitely not a table. You can confirm that with the whos command. Tables are formatted differently when displayed. Specifically, they have variable names (that look like column titles).
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Gavin
Gavin 2025-7-15
So it's not a table until I put the header on it even if I declare it as a table at the start. It's a matrix? I changed the check to ~isempty() and that works.
Thanks, that had me stumped.
Steven Lord
Steven Lord 2025-7-16
Ran in:
How exactly did you try to declare it as a table? What command did you use?
If you preallocated it to contain a certain amount of data like the following, that makes it an array (or since this is 2-dimensional, a matrix as per the definition used by the ismatrix function.) All table arrays are matrices, but it is not the case that all matrices or all arrays are tables.
a = zeros(5) % matrix and array, but not a table
a = 5×5
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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Or if you did this, that makes it a cell array not a table.
b = {1, 2, 3, 4, 5}
b = 1×5 cell array
{[1]} {[2]} {[3]} {[4]} {[5]}

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