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From Deron Eriksson <deroneriks...@gmail.com>
Subject Re: function default parameters
Date Sat, 22 Apr 2017 00:40:24 GMT
BTW, that is assuming our algorithms have been converted to functions.
Deron


On Fri, Apr 21, 2017 at 5:37 PM, Deron Eriksson <deroneriksson@gmail.com>
wrote:

> Thank you Matthias. I highly agree with your idea about having a default
> specification similar to R WRT the function signatures for default values.
>
> This becomes a significant issue for some of our algorithms, where they
> might take in 10 arguments but default values are should typically be used
> for  6+ or 7+ of the arguments.
>
> Deron
>
>
> On Fri, Apr 21, 2017 at 5:25 PM, Matthias Boehm <mboehm7@googlemail.com>
> wrote:
>
>> well, for arguments passed into dml scripts there is of course ifdef($b,
>> 2)
>> but for functions there is indeed no good support. At runtime level we
>> still support default parameters for scalar arguments at the tail of the
>> parameter list but I guess at one point the corresponding parser support
>> was discontinued.
>>
>> I personally would like a default specification similar to R in the
>> function signature with the corresponding function calls that bind values
>> to a subset of parameters.
>>
>> Regards,
>> Matthias
>>
>> On Fri, Apr 21, 2017 at 4:18 PM, Deron Eriksson <deroneriksson@gmail.com>
>> wrote:
>>
>> > Is there a way to set default parameter values using DML? I believe
>> both R
>> > and Python offer this capability.
>> >
>> > The only solution I could come up with using DML is to pass in a
>> variable
>> > that is NaN and cast this to a string and use this string in an if
>> > conditional statement.
>> >
>> > addone = function(double b) return (double a) {
>> >     c = ''+b;
>> >     if (c == 'NaN') {
>> >         b = 2.0
>> >     }
>> >     a = b + 1;
>> > }
>> >
>> > z=0.0/0.0;
>> > x = addone(z);
>> > print(x);
>> > y = addone(4.0);
>> > print(y);
>> >
>> > Is there a cleaner way to accomplish this, or is DML lacking this R
>> > feature?
>> >
>> > Deron
>> >
>> > --
>> > Deron Eriksson
>> > Spark Technology Center
>> > http://www.spark.tc/
>> >
>>
>
>
>
> --
> Deron Eriksson
> Spark Technology Center
> http://www.spark.tc/
>
>


-- 
Deron Eriksson
Spark Technology Center
http://www.spark.tc/

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