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Issue with 'intersect' arrays function

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Nia
Nia 2015-8-21
编辑： Nia 2015-8-26
I am trying to intersect two arrays but I keep getting the following error: "Input A of class cell and input B of class cell must be cell arrays of strings, unless one is a string".
My arrays look like this:
and
I cannot find the way to intersect them. I have also tried:
[dur, itimes, inewtimes ] = intersect(array2,char(array1));
but no luck.
I attach here the arrays that I am trying to intersect.

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回答（2 个）

Adam
Adam 2015-8-21
编辑：Adam 2015-8-21
You need to convert your times array to strings if you want to compare them. You can't compare a time with a string, whether with intersect or just with a general equality test.
array1 = arrayfun( @(x) char(x), array1, 'UniformOutput', false )
intersect( array2, array1 )
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Nia
Nia 2015-8-21
for some reason the elements on my array2 appear within quotation marks and that may be the cause of not being able to intersect these two arrays
Nia
Nia 2015-8-21
using:
array2=cellfun( @(x) num2str(x), array2, 'UniformOutput', false )
I get the following error: Undefined function 'abs' for input arguments of type 'cell'

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Steven Lord
Steven Lord 2015-8-21
The reason that you're having so much trouble is that your second input is a cell array of strings. When you call INTERSECT or any of the set functions with one of the inputs being a cell array of strings, both inputs must be cell arrays of strings (or a plain char vector.) Convert that second input into a duration array then you can do what I do in this example. Create two sample duration vectors.
A = seconds(0:5:seconds(hours(1)));
B = minutes(10)+seconds([1 3 5 7 9]);
Intersect them.
[commonDurations, ind1, ind2] = intersect(A, B);
Check the results. To show the results using consistent units, convert B's display format to seconds first. This doesn't change the data stored in B, just the way that data is displayed.
commonDurations
B.Format = 's';
B(ind2)
A(ind1)
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Nia
Nia 2015-8-21
@Steven: How can I convert my cell array of strings to a duration array?. I cannot find the function that does that.

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