How to generate Data using for loop

I have the following code, i am entering value manually

i want to do it using for loop how can i do that and save data in 1x1000 in mat file

prfDS = [200 500 800 1000 800 900];
n_pulsesDS = [120 400 1200 1500 600 350];
prfDS(1:120) = 200 
prfDS(121:520) = 500
prfDS(521:1720) = 800
prfDS(1721:3220) = 1000
prfDS(3220:3820) = 800
prfDS(3820:4720) = 900
scatter(1:length(prfDS),prfDS)

[Stephen23]

The last interval shown in your example indexing is inconsistent with the provided data:

cumsum([120,400,1200,1500,600,350])

ans = 1×6

120 520 1720 3220 3820 4170

Answer 1

[Stephen23]

The simple and efficient MATLAB approach would be to use REPELEM, for example:

val = [200,500,800,1000,800,900];
num = [120,400,1200,1500,600,350];
out = repelem(val,num)

out = 1×4170

200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200

numel(out)

ans = 4170

[Med Future]

@Stephen How can i convert it into 1x1000 form and save in .mat file

[Stephen23]

"How can i convert it into 1x1000 form..."

You would have to generate a 1x1000 vector from your 1x4170 vector, e.g. perform some interpolation, subsampling, take the first or last 1000 elements, or use one of many other approaches. Which approach you pick depends on you and your needs, which you have not told us.

"...and save in .mat file"

Use SAVE: https://www.mathworks.com/help/matlab/ref/save.html

[Med Future]

@Stephen how i can generate random values above

[Stephen23]

"how i can generate random values above"

https://www.mathworks.com/help/matlab/random-number-generation.html