i want to make random size of my datasample.output must give random size array. As i am very new in matlab. please help.

r=datasample('ATCG',20);

r =

TCACCAAAATCACAGGTATG

Answer 1

[Guillaume]

More explanation in the question would be helpful. Possibly, this is what you want:

pickfrom = 'ATCG';
howmany = 20;

pickvalues = pickfrom(randi(numel(pickfrom), 1, howmany))

That is use randi to select a random set of indices that give you which value to pick from your data set.

[Tonmoy saha]

thanks a lot for your valuable answer. actually i want random size samples from that datasample. suppose if the datasample is TCACCAAAATCACAGGTATG. than i want samples like CACCAA, TCACAGG,.. like that. these sample must be randomly pick and also may have different size .

[Guillaume]

It's the same principle, use randi to pick the location of your sample:

sample = 'TCACCAAAATCACAGGTATG';
subsamplelength = 6;

subsamplestart = randi(numel(sample)-subsamplelength+1); 
subsample = sample(subsamplestart : subsamplestart+subsamplelength-1)

[Tonmoy saha]

its work for me. And i change this code little bit. But i have another problem. hope you will solve it. Thanks again sir.

sample = 'TCACCAAAATCACAGGTATG';  
subsamplelength = floor(5+(10-5).*rand(1,1));  
subsamplestart = randi(numel(sample)-subsamplelength+1); 
subsample = sample(subsamplestart : subsamplestart+subsamplelength-1)

instead of fix my subsample to 6 i use this code. but i want random no.s of subsample not just one.

[Guillaume]

subsamplelength = randi([5 10]);

would be more efficient.

Why can't you create a loop whose upper bound is that random number of subsamples. Again, you can use randi to choose it randomly. Use the above code in the loop.

[Tonmoy saha]

thank you sir. you help me a lot. Actually i am doing a project using matlab. If you don't mind can i contact you further.

[Guillaume]

You'll get a lot more help by just posting questions on this forum. There's a lot of people here who are willing to help.

Answer 2

[Jos (10584)]

you want a random size sample? Like this, perhaps:

DATA = 'ATCG' 
K = randi([10 20],1) % random number between 10 and 20
Y = datasample(DATA,K)

[Tonmoy saha]

actually i want random size samples from that datasample. suppose if the datasample is TCACCAAAATCACAGGTATG. than i want samples like CACCAA, TCACAGG,.. like that. these sample must be randomly pick and also may have different size.