MATLAB: How to remove elements from a matrix

elements

I would like to delete random elements from this matrix: U = [ 't' 'h' 'e' 's' 't' 'r' 'i' 'n' 'g']

How can i do it?

Best Answer

If you have the Statistics and Machine Learning Toolbox, you can do

numberToKeep = 4;
U = U(sort(randsample(length(U),numberToKeep)));

If you do not have that toolbox, you can accomplish the same thing using a different random function, like randi, but you'll need to guard against repeated elements. Let us know if you get stuck.

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MATLAB: How to generate same set of random numbers

You can control random number generation using 'rng()' function. The usage is rng(seed).

rng(seed) seeds the random number generator using the nonnegative integer seed so that rand, randi, and randn produce a predictable sequence of numbers.

Hope that helps..!!

MATLAB: Selecting random part of string

Max - use randperm to generate a random index into your character array. Try the following

 alphabet = 'abcdefghijklmnopqrstuvwxyz';
 randIdx  = randperm(length(alphabet),1); % generate the random index into array
 randChar = alphabet(randIdx);            % get the random character
 alphabet(randIdx) = [];                  % remove the character

For example, if

 randIdx =
    14

then

 randChar =
     n

and

 alphabet =
     abcdefghijklmopqrstuvwxyz

with the 'n' removed.

Best Answer

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MATLAB: Selecting random part of string

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