Editing a cell array.
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I have a cell array
1ms 1kA 10V
2ms 2.2kA 3V
3ms 3.6kA 5.4V
I want to remove 'ms', 'kA' & 'V' from the cell array and then convert it into a matlab matrix with numerical value for further calculations.
回答（2 个）
madhan ravi
2019-1-30
编辑：madhan ravi
2019-1-30
C={'1ms' '1kA' '10V'
'2ms' '2.2kA' '3V'
'3ms' '3.6kA' '5.4V'};
Matrix=str2double(cellfun(@(x)regexp(x,'^(\d{0,5}\.{0,1}\d{0,5})','match'),C))
2 个评论
Note that regexp accepts a cell array of character vectors, so the cellfun call is totally superfluous. I recommend using the option 'once' to simplify the output handling.
Some notes about the regular expression itself:
\d{0,5}
why limited to just five digits?
\.{0,1}
is simpler as
\.?
The grouping parentheses are not required.
madhan ravi
2019-1-30
编辑：madhan ravi
2019-1-30
Agree with Stephen:
Matrix=cellfun(@str2double,regexp(C,'^(\d*\.?\d*)','match'))
% or
Matrix=str2double(regexp(C,'^(\d*\.?\d*)','match','once'))
Gives:
Matrix =
1.0000 1.0000 10.0000
2.0000 2.2000 3.0000
3.0000 3.6000 5.4000
To get the actual numeric values taking into account the SI prefixes you can use my FEX submission sip2num, which can be downloaded from FEX:
>> C = {'1ms','1kA','10V';'2ms','2.2kA','3V';'3ms','3.6kA','5.4V'}
C =
'1ms' '1kA' '10V'
'2ms' '2.2kA' '3V'
'3ms' '3.6kA' '5.4V'
>> N = cellfun(@sip2num,C)
N =
0.001 1000 10
0.002 2200 3
0.003 3600 5.4
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2019-1-30
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