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Re: [EnergyPlus_Support] Re: Dynamic change of a schedule:compact with EMS
Good to know Linda!
Marco - I find Schedule:File easier to manage than EMS. You can also put multiple schedules in the same file. Some people prefer chocolate, others like vanilla. Using Linda's method with EMS, you can use either.
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Karen
On Wed, Mar 19, 2014 at 2:50 PM, Linda Lawrie <<mailto:linda@xxxxxxxxxxxxxx>linda@xxxxxxxxxxxxxx> wrote:
>
Perhaps you need to study up on random variables -- produced by "random" distributions. Also the EMS guide
>
> If you use (as I said) the seed of ActualDateAndTime, you will indeed get different results from the random generation.
>
> If, however, you use a specific seed, you will get the same distribution of your random result. i.e., not truly random but not exactly predictable.
>
> From the guide: @SeedRandom Random Seed, controls the seed used in the random number generator for calls to @RandomUniform and @RandomNormal. Use is optional and provided for repeatable series of random numbers. The argument is rounded to the nearest whole number and then used to set the size and values of the seed for the number generator.
>
> We provided the ActualDateAndTime variable for using and making a non-repeatable series of random numbers -- that is, the sequence on runs will NOT be the same.
>
> but using the same random seed for @seedrandom WILL produce a repeatable series of random numbers.
>
> I'm sure this is confusing.
>
>
>> Set seed = 12345., !- Program Line 1
>
> the above would produce the same series of random numbers between runs.
>
>
>
>
> At 12:15 PM 3/19/2014, <mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx wrote:
>
>
>> Hello Linda,
>> I'm not too expert in that. To obtain different random results I use for a unique model this:
>>
>> EnergyManagementSystem:Program,
>> InitRandomSeed, !- Name
>> Set seed = ActualDateAndTime, !- Program Line 1
>> Set dummy = @SeedRandom seed; !- Program Line 2
>>
>> Imagine to have 3 different model with different envelopes.
>> If each model have this code, are results comparable? Should I change the previous code? If yes, how?
>>
>> Thanks,
>> Marco
>>
>
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