| erasing a post? [message #91043] |
Wed, 27 May 2015 09:08  |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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Hi,
I just tried to "answer" a post and when I hit the "post" button I found out that the message was deleted. I find it not nice to erase a post. People might have already read it and spend time on it. If it was a mistake or if you have thought of things through and you don't want an answer anymore, simply answer you own post with a "sorry, don't need this anymore".
[edit: I'm not pissed or anything, I'm just trying to make a point that it is not a drama to have a post out there that you don't need anymore]
Anyway, if anybody *still* is interested, here is my answer to the post (unfortunately I did not copy the original message: the poster wanted to compare structures):
Good evening,
there are a lot of ways of tackling this. But generally with structures you have to go through element by element. You may google compare structures and find a few solutions/suggestions on the group.
One other way of doing this (probably computationally more expensive, but slightly easier to understand) is to use hashes (http://www.exelisvis.com/docs/HASH.html). So for each structure you generate a hash:
h1 = hash(myStruct1, /extract)
h2 = hash(myStruct2, /extract)
then you can compare with the EQ or NE operators to check which values are equal or not equal. The result is a list. Here you will find an example:
http://www.exelisvis.com/docs/HASH.html#Comparing
Notice that you need IDL >8.0.
I hope it helps,
Helder
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| Re: erasing a post? [message #91044 is a reply to message #91043] |
Wed, 27 May 2015 09:14  |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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On Wednesday, May 27, 2015 at 11:08:17 AM UTC-5, Helder wrote:
> Hi,
> I just tried to "answer" a post and when I hit the "post" button I found out that the message was deleted. I find it not nice to erase a post. People might have already read it and spend time on it. If it was a mistake or if you have thought of things through and you don't want an answer anymore, simply answer you own post with a "sorry, don't need this anymore".
> [edit: I'm not pissed or anything, I'm just trying to make a point that it is not a drama to have a post out there that you don't need anymore]
>
> Anyway, if anybody *still* is interested, here is my answer to the post (unfortunately I did not copy the original message: the poster wanted to compare structures):
>
>
> Good evening,
> there are a lot of ways of tackling this. But generally with structures you have to go through element by element. You may google compare structures and find a few solutions/suggestions on the group.
> One other way of doing this (probably computationally more expensive, but slightly easier to understand) is to use hashes (http://www.exelisvis.com/docs/HASH.html). So for each structure you generate a hash:
> h1 = hash(myStruct1, /extract)
> h2 = hash(myStruct2, /extract)
> then you can compare with the EQ or NE operators to check which values are equal or not equal. The result is a list. Here you will find an example:
> http://www.exelisvis.com/docs/HASH.html#Comparing
>
> Notice that you need IDL >8.0.
>
> I hope it helps,
> Helder
The astronomy library has COMPARE_STRUCT that does this well:
http://idlastro.gsfc.nasa.gov/ftp/pro/structure/compare_stru ct.pro
-Jeremy.
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| Re: erasing a post? [message #91045 is a reply to message #91043] |
Wed, 27 May 2015 09:18 |
Lajos Foldy
Messages: 176
Registered: December 2011
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Senior Member |
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On Wednesday, May 27, 2015 at 6:08:17 PM UTC+2, Helder wrote:
> Hi,
> I just tried to "answer" a post and when I hit the "post" button I found out that the message was deleted. I find it not nice to erase a post. People might have already read it and spend time on it. If it was a mistake or if you have thought of things through and you don't want an answer anymore, simply answer you own post with a "sorry, don't need this anymore".
> [edit: I'm not pissed or anything, I'm just trying to make a point that it is not a drama to have a post out there that you don't need anymore]
>
> Anyway, if anybody *still* is interested, here is my answer to the post (unfortunately I did not copy the original message: the poster wanted to compare structures):
>
>
> Good evening,
> there are a lot of ways of tackling this. But generally with structures you have to go through element by element. You may google compare structures and find a few solutions/suggestions on the group.
> One other way of doing this (probably computationally more expensive, but slightly easier to understand) is to use hashes (http://www.exelisvis.com/docs/HASH.html). So for each structure you generate a hash:
> h1 = hash(myStruct1, /extract)
> h2 = hash(myStruct2, /extract)
> then you can compare with the EQ or NE operators to check which values are equal or not equal. The result is a list. Here you will find an example:
> http://www.exelisvis.com/docs/HASH.html#Comparing
>
> Notice that you need IDL >8.0.
>
> I hope it helps,
> Helder
I agree with you, just some clarification: posts can be deleted from Google groups, but the original post remains there on the news servers. This is an extra argument for not erasing posts :-)
regards,
Lajos
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