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Syntax for Math.pow() funtion in ATL [message #482062]

Tue, 25 August 2009 09:46

venkatesh

Messages: 41
Registered: July 2009

Member

Hi,

I wanted to some mathematical calculation in ATL.

The following code is written in java

double maxDouble = Math.pow(2, 223*8) - 1;
long maxUIntValue = Math.min((long)maxDouble, Long.MAX_VALUE);

I wanted to do same thing in ATL but i don't know how these pow() & min()
functions are defined in ATL.

Thanks
venkatesh

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[ATL] Re: Syntax for Math.pow() funtion in ATL [message #482143 is a reply to message #482062]

Tue, 25 August 2009 13:10

William Piers

Messages: 301
Registered: July 2009

Senior Member

Hello,

There is no pow() function in ATL, but you can do it using exp() and
log() functions, which are available in ATL, as the min() function.

Here is the list of the numerical functions in ATL:
http://wiki.eclipse.org/ATL/User_Guide#Numerical_data_type_o perations

Best regards,

William

venkatesh a écrit :
> Hi,
>
> I wanted to some mathematical calculation in ATL.
>
> The following code is written in java
>
> double maxDouble = Math.pow(2, 223*8) - 1;
> long maxUIntValue = Math.min((long)maxDouble, Long.MAX_VALUE);
>
>
> I wanted to do same thing in ATL but i don't know how these pow() &
> min() functions are defined in ATL.
>
>
> Thanks
> venkatesh
>

Report message to a moderator

Re: [ATL] Re: Syntax for Math.pow() funtion in ATL [message #482740 is a reply to message #482143]

Thu, 27 August 2009 17:57

venkatesh

Messages: 41
Registered: July 2009

Member

Thanks for your valuable input.

venkatesh

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Re: [ATL] Re: Syntax for Math.pow() funtion in ATL [message #483587 is a reply to message #482143]

Wed, 02 September 2009 09:01

venkatesh

Messages: 41
Registered: July 2009

Member

Hello William ,

I have tried using exp () and log funtion instead of power and min math
funtion in java

if i give let var :Integer= 2.exp()
it's working fine

but i want 2 raise to the power 8 (2^8) how to represent
this in a exp()

there is no example to use this exp() & log() function .

can u please give me some example.

Thanks

venkatesh

Report message to a moderator

Re: [ATL] Re: Syntax for Math.pow() funtion in ATL [message #483620 is a reply to message #483587]

Wed, 02 September 2009 11:15

William Piers

Messages: 301
Registered: July 2009

Senior Member

Hello,

This page http://en.wikipedia.org/wiki/Exponentiation#Real_powers
indicates that you can compute pow with exp and log functions:

b^x = exp(x*log(b))

Best regards,

William

venkatesh a écrit :
> Hello William ,
>
> I have tried using exp () and log funtion instead of power and min math
> funtion in java
>
> if i give let var :Integer= 2.exp() it's working fine
>
> but i want 2 raise to the power 8 (2^8) how to represent this in a exp()
>
> there is no example to use this exp() & log() function .
>
> can u please give me some example.
>
> Thanks
>
> venkatesh
>
>
>
>
>
>
>
>
>
>

Report message to a moderator

Re: [ATL] Re: Syntax for Math.pow() funtion in ATL [message #483840 is a reply to message #483620]

Thu, 03 September 2009 10:16

venkatesh

Messages: 41
Registered: July 2009

Member

Hello William,

I have given like this

from
v_left: LdmMetaModel!LDMAttribute
using{
---- syntax error

maxvalue: Real =exp(3*log(3))
}

but it's showing error.can u tell me how to represent this in an atl file.

thanks
venkatesh

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