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About DLR and other funny things.

November 7, 2009


(Dynamic Runtime Library) is microsoft latest technology that will prove itself as long as .NET struggle to survive.

however this is an old news, you must heard about IronPython, and IronRuby.


My Quantity System Calculator is build over the DLR expressions. This has permitted me to do a numerous things in my calculator.

I added functions, new sequence concept, and lately implemented NameSpaces.

the latest DLR version is 0.92 and you can get it from


Funny Things

if you download the last Quantity system sources from the source panel in code plex

and run this code


Qs> Sin[n](x) ..> ((-1)^n*x^(2*n+1))/(2*n+1)! #Sin sequence

Qs> Sin(x) = Sin[0++50](x) #Sin function


Qs> Math:Sin(8)
DimensionlessQuantity: 0.989358246623382 <1>
Qs> Sin(8)
DimensionlessQuantity: 0.989358246623403 <1>
can you notice the difference between the last 3 digits from right

the first function from the Math:Sin(8) is a direct calling for the .NET Math.Sin  function

and the second Sin(8) is a call for my sequence-series implementation.

well I have double checked by the windows calculator and the result was the same as the .NET library.

Windows Calculator Sin(8) in radian mode: 0.98935824662338177780812359824529

So which one is the right approximation 🙂

let’s try to call the SIN series with less items


Qs> Sin[0++20](8)

DimensionlessQuantity: 0.989358246623414 <1>

ok also have an error

let’s try it for many more items.


Qs> Sin[0++160](8)

DimensionlessQuantity: 0.989358246623403 <1>

we are back to the same result 🙂

damn it 😀 what should i trust more??  my sequence-series implementation or the .NET Sin implementation, and what if this was obtained from the FPU ???



I really don’t know.





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