Writing the built in matlab function in simple code(like for loop, etc.)

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Jimmy cho 2021-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/725032-writing-the-built-in-matlab-function-in-simple-code-like-for-loop-etc

编辑： Adam Danz 2021-1-24

采纳的回答： Image Analyst

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Hi guys,

I'm trying to do the same concept of what my code below does, but in a simple approach with different way.

My code in MATLAB is:

y=[1 2 3 4]; %first input
OccurancesParameter= 5; % second input , it's always unsigned integer number greater than zero - it's number occurances for each value in the array y
output=repelem(y, OccurancesParameter);  % gives me an array according to the repeated Occurance parameter ..

So I want to do the same concept of what my code above does, but simple approach/way in MATLAB, like using for loop or any other simple way, and not using the built in function repelem().

Could anyone please help me out on this? appreciated!

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Jimmy cho 2021-1-23

any help pelase?!

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Answer 1

Image Analyst 2021-1-23

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Jimmy, try this:

y=[1 2 3 4]; % First input
OccurancesParameter= 5; % second input , it's always unsigned integer number greater than zero - it's number occurances for each value in the array y
output=repelem(y, OccurancesParameter);  % gives me an array according to the repeated Occurance parameter ..
y2 = zeros(1, length(y) * OccurancesParameter);
for k = 1 : length(y)
	thisy = y(k);
	for k2 = 1 : OccurancesParameter
		index = (k - 1) * OccurancesParameter + k2;
		y2(index) = thisy;
	end
end
y2 % Display in command window

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Jimmy cho 2021-1-24

thanks alot!

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Answer 2

Adam Danz 2021-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/725032-writing-the-built-in-matlab-function-in-simple-code-like-for-loop-etc#answer_604707

编辑：Adam Danz 2021-1-24

在 MATLAB Online 中打开

You can use implicit expansion which is supported in Matlab r2016b and later (more info).

y=[1 2 3 4];
OccurancesParameter= 5;
m = y(:)' .* ones(OccurancesParameter, 1);
output = m(:)'
output = 1×20
     1     1     1     1     1     2     2     2     2     2     3     3     3     3     3     4     4     4     4     4

For Matlab releases prior to r2016b,

y=[1 2 3 4];
OccurancesParameter= 5;
m = bsxfun(@times,y(:)', ones(OccurancesParameter, 1));
output = m(:)'
output = 1×20
     1     1     1     1     1     2     2     2     2     2     3     3     3     3     3     4     4     4     4     4