String Vector for-loop

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zachary schneider
zachary schneider 2019-8-29
评论： Jos (10584) 2019-8-30
I recently collected some point data, and the trial number or independent variable is a string, such as:
X = ['a1' 'a2' 'a3' 'b1' 'b2' 'b3'];
I would like to create a for loop using the [1 2 3 1 2 3]. Is there any way to seperate the number and letter, or a way to us a string such as this as a for loop condition.
I do not want to use the index, and am trying to make this work for a much larger set of data, so I am trying to have it work automatically.
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zachary schneider
zachary schneider 2019-8-29
X = ['a1'; 'a2'; 'a3'; 'b1'; 'b2'; 'b3']; is the format, so yes it is a char i believe
Adam
Adam 2019-8-29
So simply
str2num( X(:,2) )
would give what you want.

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Stephen23
Stephen23 2019-8-29
编辑：Stephen23 2019-8-29
>> str = {'a1','a2','a3','b1','b2','b3'};
>> vec = sscanf([str{:}],'%*[ab]%f',[1,Inf])
vec =
1 2 3 1 2 3
>> vec = str2double(regexp(str,'\d+$','match','once'))
vec =
1 2 3 1 2 3
>> vec = str2double(regexprep(str,'^[a-z]+',''))
vec =
1 2 3 1 2 3
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Stephen23
Stephen23 2019-8-29
编辑：Stephen23 2019-8-30
>> cha = ['a1 ';'a2 ';'a3 ';'b1 ';'b2 ';'b3 ']
cha =
a1
a2
a3
b1
b2
b3
>> vec = sscanf(cha(:,2:3).','%f',[1,Inf])
vec =
1 2 3 1 2 3
"How can I make my char array in to a cell array"
out = cellstr(cha)
Jos (10584)
Jos (10584) 2019-8-30
This example strongly suggests that it is always a single digit following a single character that is relevant. If so, this will work too:
cha = ['a1 ';'a2 ';'a3 ';'b1 ';'b2 ';'b3 ']
vec = cha(:,2) - '0'

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