Matching unequal cell arrays

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Ronald
Ronald 2020-6-3
评论： Ronald 2020-6-5
I have two unequal arrays and I want to match them to produce one array such that the unmatched cells are left empty i.e
A = {124,252,1252,225,598,999}
B = {598,'plant';
1252,'nil';
252,'blue'}
The result C;
C = {124,[];
252,'blue';
1252,'nil';
225,[];
598,'plant';
999,[]}

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回答（2 个）

TADA
TADA 2020-6-3
A = {124,252,1252,225,598,999};
B = {598,'plant';...
1252,'nil';...
252,'blue'};
[~, Ai_member, Bi_member] = intersect([A{:}], [B{:,1}]);
C = [A(:), cell(numel(A), 1)];
[C{Ai_member, 2}] = B{Bi_member, 2}
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TADA
TADA 2020-6-4
编辑：TADA 2020-6-4
In that case, ismember should do the trick
it returns a logical index (flags) and the matching indices in B
for matching cells, the logical index is true and the B index has the index of the match
and for unmatched cells both indices have the value zero
A = {124,252,252,1252,225,225,598,598,999};
B = {598,'plant';...
1252,'nil';...
252,'blue'};
[flags, Bidx] = ismember([A{:}], [B{:,1}]);
C = [A(:), cell(numel(A), 1)];
[C{flags, 2}] = B{bidx(bidx > 0), 2}
C =
9×2 cell array
{[ 124]} {0×0 double}
{[ 252]} {'blue' }
{[ 252]} {'blue' }
{[1252]} {'nil' }
{[ 225]} {0×0 double}
{[ 225]} {0×0 double}
{[ 598]} {'plant' }
{[ 598]} {'plant' }
{[ 999]} {0×0 double}
Ronald
Ronald 2020-6-5
This is really good. Thank you very much!

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Stephen23
Stephen23 2020-6-4
编辑：Stephen23 2020-6-4
Using tables:
>> TA = cell2table(A(:))
TA =
Var1
____
124
252
252
1252
225
225
598
598
999
>> TB = cell2table(B'')
TB =
Var1 Var2
____ _______
598 'plant'
1252 'nil'
252 'blue'
>> T = outerjoin(TA,TB,'MergeKeys',true)
T =
Var1 Var2
____ _______
124 ''
225 ''
225 ''
252 'blue'
252 'blue'
598 'plant'
598 'plant'
999 ''
1252 'nil'
Note that the output rows are sorted by the joining key. To keep the original order:
>> [T,X] = outerjoin(TA,TB,'MergeKeys',true);
>> T(X,:) = T
T =
Var1 Var2
____ _______
124 ''
252 'blue'
252 'blue'
1252 'nil'
225 ''
225 ''
598 'plant'
598 'plant'
999 ''

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