How to convert numbers in cell array into double?

2014 8 23
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更新时间：2014 8 23
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I have a cell array like a = '22 16 55.40', which is dMS values, how to separate these three numbers into three cells into numeric array as follows:-
a = '22 16 55.40' to b = [22 16 55.40]. Any help is greatly appreciated.

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Star Strider
Star Strider 2014-8-23

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The textscan function works:
a = {'22 16 55.40'};
b = textscan(char(a), '%f %f %f')
produces:
b =
[22.0000e+000] [16.0000e+000] [55.4000e+000]
with b being a (1x3) cell array.

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