RandStream State
in [Matlab]
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From: David on 29 Mar 2010 02:44 Hi all, I have a question regarding setting the state of RandStream: If I want to set the state of the default stream to "mystate", I have to do the following: ds=RandStream.getDefaultStream; ds.State=mystate; My question is why can't I just execute this: RandStream.getDefaultStream.State=mystate I tried the line above and it corrupts RandStream; it causes problems with legit operations such as RandStream creation such as bob=RandStream.create('mt19937ar','Seed',10) ). Thanks, David
From: Peter Perkins on 29 Mar 2010 09:05
On 3/29/2010 2:44 AM, David wrote: > If I want to set the state of the default stream to "mystate", I have to > do the following: > ds=RandStream.getDefaultStream; > ds.State=mystate; > > My question is why can't I just execute this: > RandStream.getDefaultStream.State=mystate David, you have to remember that getDefaultState is a method. You can call it without parentheses (because it takes no input arguments), but really what you're doing is RandStream.getDefaultStream().State=mystate MATLAB does not support directly subscripting on the result of a function or method call. In this case what you've done is being interpreted as creation of a structure within a newly-created structure, which is legal. > I tried the line above and it corrupts RandStream; it causes problems > with legit operations such as RandStream creation such as > bob=RandStream.create('mt19937ar','Seed',10) ). What happens in this case is that a scalar structure named RandStream gets created. It has one field, named getDefaultStream, which itself has one field. named State. That scalar structure hides the class. Hope this helps. |