# Getting values separated by commas from a string array

조회 수: 9(최근 30일)
Luis Ricardo Rivera Goitia 2023년 3월 20일
댓글: Luis Ricardo Rivera Goitia 2023년 3월 21일
I have this string array:
str
113x 1
"52,884,410"
"44,878,410"
"46,896,410"
"82,941,410"
.
.
.
"130,890,415"
and I would like to extract each one of these values independently to assign a different variable to each one of them, for instance, X to the first group of numbers before the first comma, y to the group of numbers between commas, and z to the last group of numbers.
When using str2num or str2double it converts it to NaN insteas of numbers.
I used X = str2num(srt(1,:)) and I got the first one as a double [52 884 410], but don't know how to have only an array only for the first group to assign it to X taking into account all the values from the array.
##### 댓글 수: 2표시 이전 댓글 수: 1숨기기 이전 댓글 수: 1
Luis Ricardo Rivera Goitia 2023년 3월 21일
This variable comes from an MQTT Topic, which at the beginning is a Table divided in three columns:
Topic, QualityOfService, Callback
Then I read the Topic directly from the MQTT Broker to obtain a timetable:
Time, Topic, Data
In the last column, I mean "Data" I have these values:
row 1 "{115,878,51}"
row2 2 "{121,80,57}"
.
.
.
row n "{56,890,47}"
So I create a new string array called:
New_Data = dataTT.Data which I used to extract the values just like you told, but before I get rid of the brackets,
str = New_Data
str = strrep(str,'{','');
str = strrep(str,'}','');
tmp = split(str,",");
current = str2double(tmp(:,1));
speed = str2double(tmp(:,2));
time = str2double(tmp(:,3));

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### 채택된 답변

Cris LaPierre 2023년 3월 20일
One way is to use split.
str = ["52,884,410"
"44,878,410"
"46,896,410"
"82,941,410"
"130,890,415"]
str = 5×1 string array
"52,884,410" "44,878,410" "46,896,410" "82,941,410" "130,890,415"
tmp = split(str,",");
x = str2double(tmp(:,1))
x = 5×1
52 44 46 82 130
y = str2double(tmp(:,2))
y = 5×1
884 878 896 941 890
z = str2double(tmp(:,3))
z = 5×1
410 410 410 410 415
##### 댓글 수: 1표시 없음숨기기 없음
Luis Ricardo Rivera Goitia 2023년 3월 20일
Thank you so much Cris, it worked! I appreciate your help! :)

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### 추가 답변(1개)

Steven Lord 2023년 3월 20일
You can do this with split and double.
S = ["52,884,410"
"44,878,410"
"46,896,410"
"82,941,410"]
S = 4×1 string array
"52,884,410" "44,878,410" "46,896,410" "82,941,410"
S2 = split(S, ",")
S2 = 4×3 string array
"52" "884" "410" "44" "878" "410" "46" "896" "410" "82" "941" "410"
D = double(S2)
D = 4×3
52 884 410 44 878 410 46 896 410 82 941 410
This assumes each of the elements in S contains the same number of numbers. If not split will throw an error.
T = ["123,456"; "789,012,345"]
T = 2×1 string array
"123,456" "789,012,345"
T2 = split(T, ",")
Error using split
Element 2 of the text contains 2 delimiters while the previous elements have 1. All elements must contain the same number of delimiters.

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