extracting first letter from the cell

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KDRA
KDRA 2018-10-15
编辑： Kyle Pastor 2020-4-9
hello,
I have two cell arrays: nam1 = {'John', 'Adam', 'Emma'} nam2 = {'Doe', 'Willson', 'Brown'}
I want to create one array with initials, like this: init = {'JD', 'AW', EB'}
I tried extracting first letters from each array like this:
if true
% code
end
ininam1 = cellfun (@(x) x(1),nam1,'un',0)
ininam2 = cellfun (@(x) x(1),nam2,'un',0)
but this already fails (Index exceeds array bounds). Can you help me with this? Also combining these two arrays together?
Thanks in advance!
K.
  2 个评论
Stephen23
Stephen23 2018-10-15
It worked fine when I tried it:
>> nam1 = {'John', 'Adam', 'Emma'};
>> nam2 = {'Doe', 'Willson', 'Brown'};
>> ininam1 = cellfun (@(x) x(1),nam1,'un',0)
ininam1 = 'J' 'A' 'E'
>> ininam2 = cellfun (@(x) x(1),nam2,'un',0)
ininam2 = 'D' 'W' 'B'
Kyle Pastor
Kyle Pastor 2020-4-9
编辑：Kyle Pastor 2020-4-9
I had the same issue. Turns out one of the elements of my cell arrays was an empty string.
A = {'Works','OK_DOKIE',''};
element 3 will cause the fail!
-K

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采纳的回答

Kevin Chng
Kevin Chng 2018-10-15
编辑：Kevin Chng 2018-10-15

Hi,

nam1 = {'John', 'Adam', 'Emma'} ;
nam2 = {'Doe', 'Willson', 'Brown'};

ininam1 = strcat(nam1{1}(1),nam2{1}(1))
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KDRA
KDRA 2018-10-15
This gives me only 'JD' and the rest disappears..
Kevin Chng
Kevin Chng 2018-10-15
It will return all the combination in name
nam1 = {'John', 'Adam', 'Emma'} ;
nam2 = {'Doe', 'Willson', 'Brown'};
ininam1 = cellfun (@(x) x(1),nam1,'un',0);
ininam2 = cellfun (@(x) x(1),nam2,'un',0);
name=strcat(ininam1,ininam2);

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更多回答（1 个）

Adam
Adam 2018-10-15
res = cellfun( @(x,y) [x(1) y(1)], nam1, nam2, 'UniformOutput', false' )
works fine for me on your example, but then so does your own code. Do you have an actual example where it leads to an error?
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Adam
Adam 2018-10-15
编辑：Adam 2018-10-15
Well, the problem certainly appears to be with your inputs, but I don't know from that exactly what the inputs look like. The example you gave works fine and I would imagine any pair of cell arrays of equal length, each of which have names of at least 1 letter in them would work. If you have empty cells or if nam1 and nam2 are not the same length then it won't work.
What do nam1 and nam2 look like in a real case that fails? Giving a simplified example in a question is useful, but only if it replicates the problem you are having for the question you ask!
KDRA
KDRA 2018-10-15
I literally have 3 names and 3 family names, I just changed them to fake names. They indeed have the same length and they are not empty so in a nutshell, is exactly the same as my simple example.
with this:
if true
% code
end
ininam1 = cellfun (@(x) x(1:1),nam1,'un',0);
ininam2 = (cellfun (@(x) x(1:1),nam2,'un',0)).';
I managed to extract first letters from both arrays and combine tohether with this line: name=strcat(ininam1,ininam2); Still not sure why your solution did not work...

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