Cell array element comparison

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Frederik Berenz
Frederik Berenz 2016-1-12
回答： Image Analyst 2016-1-12
Hi everybody,
i have a big excel table full of strings. For further operations i want to convert all strings to a number by a translation table.
For example my raw table (cell array) out of the excel worksheet:
1 'MG1' 'GD8' 'AR1' 'MP6' 3665 72,4
2 'MG3' 'G43' 'AR2' 'MP5' 3665 72
3 'MG2' 'G42' 'AR1' 'MA5' 4330 74
4 'MG5' 'GF1' 'AR3' 'MA5' 4330 73,5
5 'MG3' 'GD8' 'AR1' 'MP6' 2990 71
6 'MG2' 'GD8' 'AR1' 'MP6' 3665 73
Now i want to transfer this table into an numeric table by this translation table, e.g.
'MG1' 1
'MG2' 2
'MG3' 3 ...
to such a table:
1 1 1 1 1 3665 72,4
2 3 2 2 2 3665 72
3 2 3 1 3 4330 74
4 4 4 3 3 4330 73,5
5 3 1 1 1 2990 71
6 2 1 1 1 3665 73
The way I wanted to do is by this:
[num,text,raw]=xlsread('TestTable.xlsx')
for i=1:6
for j=2:5
if (raw(i,j)=={'GD1'})
raw(i,j)=1;
%and so on
end
end
end
But the comparison of the cell array elements doesn't work. Is there maybe an even better way? Switch/case doesn't work with cell array elements i guess...
  1 个评论
per isakson
per isakson 2016-1-12
编辑：per isakson 2016-1-12
It might be easier to do something like this
>> str = 'MG2';
>> % ignore two characters and convert the rest to numeric
>> sscanf( str, '%*2c%f' )
ans =
2
Use strcmp rather than == to compare strings

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回答（1 个）

Image Analyst
Image Analyst 2016-1-12
Simply use readtable():
t = readtable('TestTable.xlsx')
% Extract column #2, then column #1 into a new table, t2column:
t2column = t(:[2,1]);
I didn't test it but I think it should work.

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