get the last for digits of the messages and create another array with them

Question

flashpode 2021-9-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1453014-get-the-last-for-digits-of-the-messages-and-create-another-array-with-them

评论： flashpode 2021-9-14

i asked before how to get the last 4 digits of a certain message but what i want to do is to create a string with those numbers here is the code that I hace and an exemple of the type of message:

TimeAIS1 = [];

for i=1:1:N

seq1=AIS1(i)

linia=convertStringsToChars(seq1);

linia(end-3:end)

TimeAIS1 = [TimeAIS1,linia(end-3:end)];

end

TimeAIS1([TimeAIS1],:) = [];

My result is a char and what i want is a string with those numbers. the type of message is the following:

"!AIVDM,2,1,3,B,54hG=R82FP2e`LQc:208E8<v1HuT4LE:2222220U1pI446b;070PDPiC3kPH,0*720000"

Thank you so much

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Answer 1

Cris LaPierre 2021-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/1453014-get-the-last-for-digits-of-the-messages-and-create-another-array-with-them#answer_787194

在 MATLAB Online 中打开

They are characters because you convert your string to a character array. Ether convert the result back to a string using string, or better yet, use a function designed to operate on strings like extractAfter.

AIS1(1) = "!AIVDM,2,1,3,B,54hG=R82FP2e`LQc:208E8<v1HuT4LE:2222220U1pI446b;070PDPiC3kPH,0*720000";
TimeAIS1 = [];
for i=1:1
    seq1=AIS1(i);
    TimeAIS1 = [TimeAIS1,extractAfter(seq1,strlength(seq1)-4)]
end
TimeAIS1 = "0000"