MATLAB: How to feel an array with 3 numbers randomly

programming

Hi,

I have an array say A, now it could contain 10,20,30 and 40 elements. Now I want to fill this array with 90,105,120 numbers randomly.

i.e my array would contain 10/20/30/40 elements but each time it have to be filled up with only 90,105,120 values randomly

Best Answer

Do I understand you correctly? In case of the 10 values array, you'd like to have e.g.

A=[90 120 105 105 120 90 90 90 120 105]

I'd go like this:

nums=[90 105 120];
A=nums(randi(3,1,10));

In case of 20 or more values, just change the third parameter in the randi function.

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MATLAB: Shift array to left or right, keep length and feel zero empty area

I'm not aware of a function that will do exactly what you describe. However, the final result is still possible if you are willing to break the process up into steps.

A  = [1 2 3 4 5 6 7 8 9];
B = zeros(size(A));
B(3:end) = A(1:7)
B = 1×9
     0     0     1     2     3     4     5     6     7
% or
n = -2;
B = circshift(A,n);
if n>0
    B(1:n) = 0
else
    B(end+n+1:end) = 0
end
B = 1×9
     3     4     5     6     7     8     9     0     0
●

MATLAB: I feel like I’m missing something obvious, but there is an issue with the sin() involving the array indices. Can someone please help

Try clear all at the very beginning and try again , it clearly shows that you have a variable named sin

Note: don't name a variable type it may contradict with the inbuilt function.

instead of

type1 == 'r'

replace with

strcmpi(type1,'r')==1

Best Answer

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MATLAB: Shift array to left or right, keep length and feel zero empty area

MATLAB: I feel like I’m missing something obvious, but there is an issue with the sin() involving the array indices. Can someone please help

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