Need matrix or vector with 1,0,1,0,1,0.........

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Lubos Plechac
Lubos Plechac 2021-10-12
评论： Stephen23 2025-5-11
clc;clear
n = 5
A = ones(n)
a = reshape(A,1,25) % I reshape matrix to vector I think that is easy to understand.
I dont know what to do as next step to make vector or matrix with 1 and 0. Give me please more ways how to do that. Iam begginer of programming and if you could give me advice how to start with programming , what could help me to understand syntax and ways of programming and more things about programming I would be grateful. Thanks all :)

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采纳的回答

John D'Errico
John D'Errico 2021-10-12
编辑：John D'Errico 2021-10-12
Ran in:
Hint: Use mod.
For example,
mod(1:25,2)
ans = 1×25
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
But really, you need to start by looking at the Onramp tutorials, or read any text. I looked on YouTube once, and I found many beginning courses in MATLAB. When trying to learn any tool, it is a good idea to read the manuals.

更多回答（2 个）

Jan
Jan 2021-10-12
Ran in:
Do you now the colon operator already?
a = 2;
b = 15;
a:b
ans = 1×14
2 3 4 5 6 7 8 9 10 11 12 13 14 15
a:3:b
ans = 1×5
2 5 8 11 14
You can use this to create an index of the values, you want to set to 1 (or to zero):
x = ones(1, 10);
x(1:2:10) = 0
x = 1×10
0 1 0 1 0 1 0 1 0 1
Mustafa
Mustafa 2025-5-10
A = ones(n); % creates [n x n] - matrix
a = reshape(A,1,25); % creates a [1 x n^2] - matrix
As I understand you want the output in the double-format. I want to show this in logical-format too. What is about:
n = 5;
1) a1 = repmat([0,1],1,n^2); % double-format
2) a2 = logical(a1); % logical-format
3) a3 = repmat([false,true],1,n^2); % logical-format
The results of a2 and a3 should be the same. a2 converts a1 from double into logical but a3 should be faster than a2.
If you handle big matrices (large n): I don't know the efficiency of the built-in-function named "repmat()".
Greetings,
Mustafa
  1 个评论
Stephen23
Stephen23 2025-5-11
Ran in:
n = 6e7;
timeit(@() logical(repmat([0,1],1,n)))
ans = 0.3021
timeit(@() repmat([false,true],1,n))
ans = 0.0146

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