| Re: Constant Size Array in Class Init [message #76228] |
Mon, 23 May 2011 15:18 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Chris Williams writes:
> I just realized that all the fields of the class are private by
> default and there is no way I am going to write 50 setters and getters
> for a data storage class. I'm just going to do what I need to do in
> python.
Goodness, I wouldn't write 50 getters and setters either!!
Sounds like JAVA to me. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Constant Size Array in Class Init [message #76229 is a reply to message #76228] |
Mon, 23 May 2011 15:16  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Chris Williams writes:
> Hmm, now I get "Pointer expression not allowed in this context" when
> entering the initialization function.
Did you restart IDL after you changed the class definition?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Constant Size Array in Class Init [message #76230 is a reply to message #76229] |
Mon, 23 May 2011 15:11 |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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On May 23, 7:03 pm, Chris Williams <fam36boozl...@gmail.com> wrote:
> I just realized that all the fields of the class are private by
> default and there is no way I am going to write 50 setters and getters
> for a data storage class. I'm just going to do what I need to do in
> python.
Just a couple of ideas:
It does not have to be 100 functions. It can be just two (get/
setproperty), either each one with 50 arguments, or just one argument,
with uses of execute() or scope_varfetch().
But in this case maybe just putting an extra layer would be more
convenient. You can group everything into a single container (by a
pointer, a structure, a hash or a list, whichever is more convenient),
and then pass just that one container with get/setproperty.
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| Re: Constant Size Array in Class Init [message #76231 is a reply to message #76230] |
Mon, 23 May 2011 15:03 |
Chris Williams
Messages: 4
Registered: May 2011
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Junior Member |
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On May 23, 5:32 pm, David Fanning <n...@idlcoyote.com> wrote:
> Chris Williams writes:
>> I am creating a class that holds multidimensional data of several
>> different arrays.What I am trying to do is create a class to hold the
>> arrays, and then define the array sizes in the init function since
>> they will be different sizes.
>
>> For example, I want to do something like this
>
>> FUNCTION myclass:init, dim1, dim2, dim3
>
>> myarray = dblarr(dim1, dim2, dim3)
>
>> RETURN,1
>> END
>
>> PRO myclass__define
>
>> void = {myclass, myarray :dblarr } ;NO SIZE ON ARRAY
>
>> RETURN
>> END
>
>> However, I get a conflicting data structure error without first
>> defining the size of the array in the procedure myclass__define. Is
>> there an empty array object that allows me to define the array size at
>> initialization and not at object creation?
>
> You are going to have to define this field as a pointer
> to an array in IDL.
>
> void = {myclass, myarray :ptr_new() } ;NO SIZE ON ARRAY
>
> Then,
>
> myArray = Ptr_New(dblarr(dim1,dim2,dim3))
> Help, *myArray
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
I just realized that all the fields of the class are private by
default and there is no way I am going to write 50 setters and getters
for a data storage class. I'm just going to do what I need to do in
python.
Thanks a ton David.
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| Re: Constant Size Array in Class Init [message #76233 is a reply to message #76231] |
Mon, 23 May 2011 14:59 |
Chris Williams
Messages: 4
Registered: May 2011
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Junior Member |
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On May 23, 5:32 pm, David Fanning <n...@idlcoyote.com> wrote:
> Chris Williams writes:
>> I am creating a class that holds multidimensional data of several
>> different arrays.What I am trying to do is create a class to hold the
>> arrays, and then define the array sizes in the init function since
>> they will be different sizes.
>
>> For example, I want to do something like this
>
>> FUNCTION myclass:init, dim1, dim2, dim3
>
>> myarray = dblarr(dim1, dim2, dim3)
>
>> RETURN,1
>> END
>
>> PRO myclass__define
>
>> void = {myclass, myarray :dblarr } ;NO SIZE ON ARRAY
>
>> RETURN
>> END
>
>> However, I get a conflicting data structure error without first
>> defining the size of the array in the procedure myclass__define. Is
>> there an empty array object that allows me to define the array size at
>> initialization and not at object creation?
>
> You are going to have to define this field as a pointer
> to an array in IDL.
>
> void = {myclass, myarray :ptr_new() } ;NO SIZE ON ARRAY
>
> Then,
>
> myArray = Ptr_New(dblarr(dim1,dim2,dim3))
> Help, *myArray
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Hmm, now I get "Pointer expression not allowed in this context" when
entering the initialization function.
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| Re: Constant Size Array in Class Init [message #76237 is a reply to message #76233] |
Mon, 23 May 2011 14:32 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Chris Williams writes:
> I am creating a class that holds multidimensional data of several
> different arrays.What I am trying to do is create a class to hold the
> arrays, and then define the array sizes in the init function since
> they will be different sizes.
>
> For example, I want to do something like this
>
> FUNCTION myclass:init, dim1, dim2, dim3
>
> myarray = dblarr(dim1, dim2, dim3)
>
> RETURN,1
> END
>
> PRO myclass__define
>
> void = {myclass, myarray :dblarr } ;NO SIZE ON ARRAY
>
> RETURN
> END
>
> However, I get a conflicting data structure error without first
> defining the size of the array in the procedure myclass__define. Is
> there an empty array object that allows me to define the array size at
> initialization and not at object creation?
You are going to have to define this field as a pointer
to an array in IDL.
void = {myclass, myarray :ptr_new() } ;NO SIZE ON ARRAY
Then,
myArray = Ptr_New(dblarr(dim1,dim2,dim3))
Help, *myArray
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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