how to do for loop 2nd level?

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0 个投票

hi guys, i want to do :

XY :

AA

AB

AC

AD

..

QQ

but this error happened.

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Arif 2024-3-11

Here is my code

clc

clear

beam = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q'}

column = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q'}

for i = 1 : length(beam)

x(i) = string(beam(i))

for j = 1 : length(column)

y(j) = string(column(j))

xy(i) = append(x(i),y(j))

end

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Answer 1

Rik 2024-3-11

编辑：Rik 2024-3-11

在 MATLAB Online 中打开

0 个投票

Your code can be optimized, but here are the minimal changes.

beam = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q'};
column = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q'};
xy=repmat("",numel(beam)*numel(column),1);
k=0;
for i = 1 : numel(beam)
    x = string(beam(i));
    for j = 1 : numel(column)
        y = string(column(j));
        k=k+1;
        xy(k) = x+y;
    end
end
xy
xy = 289×1 string array
    "AA"
    "AB"
    "AC"
    "AD"
    "AE"
    "AF"
    "AG"
    "AH"
    "AI"
    "AJ"
    "AK"
    "AL"
    "AM"
    "AN"
    "AO"
    "AP"
    "AQ"
    "BA"
    "BB"
    "BC"
    "BD"
    "BE"
    "BF"
    "BG"
    "BH"
    "BI"
    "BJ"
    "BK"
    "BL"
    "BM"

Now for the more compact version (using implicit expansion and transposing with .'):

beam = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q'};
column = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q'};
xy = string(beam).'+string(column);
xy = xy(:);
xy
xy = 289×1 string array
    "AA"
    "AB"
    "AC"
    "AD"
    "AE"
    "AF"
    "AG"
    "AH"
    "AI"
    "AJ"
    "AK"
    "AL"
    "AM"
    "AN"
    "AO"
    "AP"
    "AQ"
    "BA"
    "BB"
    "BC"
    "BD"
    "BE"
    "BF"
    "BG"
    "BH"
    "BI"
    "BJ"
    "BK"
    "BL"
    "BM"

Or perhaps even this:

beam = string(num2cell('A':'Q'));
column = string(num2cell('A':'Q'));
xy = reshape(beam+column.',[],1);
xy
xy = 289×1 string array
    "AA"
    "AB"
    "AC"
    "AD"
    "AE"
    "AF"
    "AG"
    "AH"
    "AI"
    "AJ"
    "AK"
    "AL"
    "AM"
    "AN"
    "AO"
    "AP"
    "AQ"
    "BA"
    "BB"
    "BC"
    "BD"
    "BE"
    "BF"
    "BG"
    "BH"
    "BI"
    "BJ"
    "BK"
    "BL"
    "BM"

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Arif 2024-3-16

thanks

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how to do for loop 2nd level?

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