hai i need a command for following details........

Here i am using the following command

as

>> randperm(12,4)
>>   1     3     8    12

In above command the maximum value is 12 for this command.

How can i set the the limit of randperm command ie the result should be as the range of 2 to 12???????????

the answer may be as

>>2 5 6 7........

[Jan]

Please post one thread per problem only. See: https://www.mathworks.com/matlabcentral/answers/372244-need-a-command-as-simple-things-sir

Answer 1

[Birdman]

One approach:

while true
a=randperm(12,4)
if max(a)>7
else
break;
end
end

[VIJAY]

Thank you so much.............. eventhough is there any single command sir?????

[Birdman]

Unfortunately no, please check the randperm's page for more information about it.

https://www.mathworks.com/help/matlab/ref/randperm.html

[KL]

Unfortunately no...

Yes, there is. Check my answer.

[Jan]

Why complicated if it can be written simpler? Compare:

if max(a) > 7
else
  break;
end

with

if max(a) <= 7
  break;
end

But the original question does not contain a limit like max(a) <= 7, but "the range of 2 to 12".

Answer 2

[KL]

Simpler:

Use randsample

https://www.mathworks.com/help/stats/randsample.html

 randsample(2:12,4)
 ans =
     9     3     4     2

[Birdman]

Where is the limit in this case?

[KL]

2:12 is the limit.

randsample samples specified number of values(4) from the given vector. The given vector should contain the numbers within the limits (2 to 12).

[Birdman]

But for instance he wants to generate 4 numbers from 2 and 12 and wants the maximum from those 4 numbers to be 7. The problem is different.

[KL]

But for instance he wants to generate 4 numbers from 2 and 12 and wants the maximum from those 4 numbers to be 7...

Where is it mentioned?

If the generated numbers should be from 2 to 12 but their maximum should be 7... well, I cannot wrap my head around this. Do you mean you want to generate numbers between 2 to 7?

[VIJAY]

Thank You sir .Is it possible to create an array by using this command(randsample(2:12,4)) for example the array size is 7*4 etc etc...???????

[Birdman]

@KL: That was what I understand and it seems that it was what he wanted.

[KL]

You might need a loop or something like arrayfun,

 result = cell2mat(arrayfun(@(x)randsample(2:12,4),1:7,'uni',0)')
 result =
     2     6     3     9
     6     4     2     5
     8     5     7    10
     8     3     5    11
     4     2     3     7
     7     5     6     4
     8     6     5    12

[VIJAY]

Thank you........

[Jan]

@Birdman: I do not see any limit of 7 for the values in the question also. "Values from 2 to 12 with maximum 7" is not even meaningful, but this would be "values from 2 to 7".

Answer 3

[Walter Roberson]

"s it possible to create an array by using this command(randsample(2:12,4)) for example the array size is 7*4 etc etc...???????"

[~,temp] = sort(rand(7, 11), 2);
result = 1 + temp(:,1:4));

The range 2 to 12 is achieved by taking the range 1 to 11 and adding 1 to that.

The random ordering is done by sorting random numbers by rows. This method of sort() is what randperm it self used to use.

[Jan]

randperm uses the sorting of a random vector only, if it is called with 1 input. For 2 inputs I assume the faster Fisher-Yates-Shuffle is applied (at least randperm(n,n) is much faster than randperm(n) - enhancement request was sent already).

Nevertheless, randperm(11, 4) + 1 is an easy solution also, but must be called in a loop.