how to specify numbers in an array with varying steps

Question

A Poyser 2024-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/2132141-how-to-specify-numbers-in-an-array-with-varying-steps

回答： Star Strider 2024-6-26

采纳的回答： Star Strider

I want to specify the a group of numbers in an array but they do not appear in even steps.

I want to capture

N1 (1 and 12), N2 (2,3,4,10,11), N3(5,6,7,8,9) and N4 (13, 14)

I understand that to capture N1,and N4 I can specify the individual array numbers, and for N3 I can specify the start and the end and the size of the steps [5:1:9]. I just can't work out how to specify what I would like in the instance of N2

Please help.

Thanks

Alex

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Aditya 2024-6-26

For N2 you can create it like this: N2 = [2:1:4, 10:1:11]

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Answer 1

Star Strider 2024-6-26

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在 MATLAB Online 中打开

For ‘N2’ and others, just use the individual aray indices in a vector —

N = rand(1,14)
N = 1x14
    0.9276    0.2641    0.4683    0.1720    0.9337    0.3857    0.6798    0.7333    0.7803    0.1052    0.2883    0.7299    0.7880    0.4599
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
N2 = N([2:4 10:11])
N2 = 1x5
    0.2641    0.4683    0.1720    0.1052    0.2883
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
N2 = N([2,3,4,10,11])
N2 = 1x5
    0.2641    0.4683    0.1720    0.1052    0.2883
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>

Note the use of square brackets [] here to concatenate the individual elements.

.

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Answer 2

Namnendra 2024-6-26

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Hello Alex,

To specify a group of numbers in an array that do not appear in even steps, you can manually create the array by specifying each element individually. For `N2`, which includes the numbers `[2, 3, 4, 10, 11]`, you can simply list these numbers in an array.

Here's how you can define all the groups in MATLAB:

% Define the groups
N1 = [1, 12];
N2 = [2, 3, 4, 10, 11];
N3 = [5:1:9]; % or simply [5, 6, 7, 8, 9]
N4 = [13, 14];
% Display the groups
disp('N1:');
disp(N1);
disp('N2:');
disp(N2);
disp('N3:');
disp(N3);
disp('N4:');
disp(N4);

In the case of `N2`, you need to manually list each number because they do not follow a consistent step pattern. The other groups (`N1`, `N3`, and `N4`) can be defined using ranges or individual elements as appropriate.

Explanation:

- N1: `[1, 12]` - This group contains the numbers 1 and 12.

- N2: `[2, 3, 4, 10, 11]` - This group contains the numbers 2, 3, 4, 10, and 11. Since these numbers do not follow a consistent step pattern, you list them individually.

- N3: `[5:1:9]` - This group contains the numbers from 5 to 9 with a step size of 1. You can also specify it as `[5, 6, 7, 8, 9]`.

- N4: `[13, 14]` - This group contains the numbers 13 and 14.

By defining the groups in this way, you can easily capture and work with the specified numbers in your MATLAB code.

I hope the above information helps you.

Thank you.