extract data from string

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Trae
Trae 2022-4-30
编辑： dpb 2022-4-30
'%R1P,0,0:0,0.452743429299473,0.000005129603507,0.0000002,0,0.000002,0,0,25899036'
How could I extract the 4th,5th,10th and 11th data from this string to a matrix?

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Voss
Voss 2022-4-30
Ran in:
Maybe something like this:
str = '%R1P,0,0:0,0.452743429299473,0.000005129603507,0.0000002,0,0.000002,0,0,25899036';
% split str on commas into a cell array:
c = strsplit(str,',')
c = 1×11 cell array
{'%R1P'} {'0'} {'0:0'} {'0.452743429299473'} {'0.000005129603507'} {'0.0000002'} {'0'} {'0.000002'} {'0'} {'0'} {'25899036'}
% convert elements [4 5 10 11] to numeric:
m = str2double(c([4 5 10 11]));
% display elements of m separately:
format long
for ii = 1:numel(m)
disp(m(ii));
end
0.452743429299473 5.129603507000000e-06 0 25899036
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Trae
Trae 2022-4-30
hw to chnge the headings
Voss
Voss 2022-4-30
One way is to type them out:
headings = {'No' 'whatever' 'they' 'should' 'be'};

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更多回答（1 个）

dpb
dpb 2022-4-30
编辑：dpb 2022-4-30
The dead-ahead approach...
>> tok=split(s,',');
>> str2double(tok([4:5 10:11]))
ans =
0.45274
5.1296e-06
0
2.5899e+07
>>
A different solution to the second Q? would be more like
VARS=[4 5 10 11]; % the wanted variables
tok=strsplit(s,',');
vNames=compose('Var%02d',1:numel(VARS));
tData=array2table(str2double(tok(VARS)),'VariableNames',vNames);
The results of the last plus how to change names example are:
>> tData=array2table(str2double(tok(VARS)),'VariableNames',vNames)
tData =
1×4 table
Var01 Var02 Var03 Var04
_______ __________ _____ __________
0.45274 5.1296e-06 0 2.5899e+07
>> tData.Properties.VariableNames(2)={'MyNewName'}
tData =
1×4 table
Var01 MyNewName Var03 Var04
_______ __________ _____ __________
0.45274 5.1296e-06 0 2.5899e+07
>>
This takes advantage that the table has the facility for variable names built into the class as an integral part of the class instead of confusing data and the title into a single variable from which it always has to be extracted in order to use the data in the array....and, it allows the data to be of any type whereas adding a variable name for a numeric array requires that the whole array then be a cell array to hold the disparate data types.

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