# Export OT Interval to 2-point Sample **URL:** \ **Category:** Python usage\ **Tags:** feature-request, api\ **Created:** [October 3, 2020, 6:06pm UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36 "2020-10-03T18:06:17Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![josephmure](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/josephmure/32/114_2.png) [@josephmure](https://openturns.discourse.group/u/josephmure)\ **Post date:** [October 3, 2020, 6:06pm UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/1 "2020-10-03T18:06:17Z")
Is there a way to export OpenTURNS Intervals to Samples or numpy arrays? I figure that since Intervals have 2 boundaries in every dimension, they could in theory be turned to Samples of size 2 (with the dimension staying the same). Let us consider an example. ```auto import openturns as ot ot.Interval(0.6, 1.2) ``` Is there a way to convert `ot.Interval(0.6, 1.2)` into `ot.Sample([[0.6], [1.2]])`? ---
**Author:** ![regislebrun](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/regislebrun/32/154_2.png) [@regislebrun](https://openturns.discourse.group/u/regislebrun)\ **Post date:** [October 5, 2020, 12:31pm UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/2 "2020-10-05T12:31:53Z")
There is no such service but it could easily be added. What do you prefer? A constructor of Sample based on an Interval (mySample=Sample(myInterval)) or a conversion method (mySample=myInterval.toSample())? ---
**Author:** ![MichaelBaudin](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/michaelbaudin/32/9_2.png) [@MichaelBaudin](https://openturns.discourse.group/u/MichaelBaudin)\ **Post date:** [October 5, 2020, 12:34pm UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/3 "2020-10-05T12:34:18Z")
Here is a way: ```auto import openturns as ot interval = ot.Interval(0.6, 1.2) lower = interval.getLowerBound() upper = interval.getUpperBound() sample = ot.Sample([lower, upper]) ``` This should work in any dimension. Perhaps you searched for a more straightforward method? Regards, Michaël ---
**Author:** ![dumas](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/dumas/32/12_2.png) [@dumas](https://openturns.discourse.group/u/dumas)\ **Post date:** [October 5, 2020, 12:41pm UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/4 "2020-10-05T12:41:41Z")
I also use such transformation as shown by Michaël. If a service is provided, in my case, I would prefer to have a constructor based on an Interval. Antoine ---
**Author:** ![josephmure](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/josephmure/32/114_2.png) [@josephmure](https://openturns.discourse.group/u/josephmure)\ **Post date:** [October 6, 2020, 9:35am UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/5 "2020-10-06T09:35:16Z")
I agree with Antoine, having a Sample constructor based on an Interval would be great. ---
**Author:** ![josephmure](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/josephmure/32/114_2.png) [@josephmure](https://openturns.discourse.group/u/josephmure)\ **Post date:** [October 6, 2020, 9:36am UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/6 "2020-10-06T09:36:30Z")
Yes, I would like to avoid writing this code block. ---
**Author:** ![schueller](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/schueller/32/3_2.png) [@schueller](https://openturns.discourse.group/u/schueller)\ **Post date:** [October 8, 2020, 7:52am UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/7 "2020-10-08T07:52:20Z")
I dont agree we need a constructor from interval for 1 line: ```auto sample = ot.Sample([interval.getLowerBound(), interval.getUpperBound()]) ``` ---
**Author:** ![josephmure](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/josephmure/32/114_2.png) [@josephmure](https://openturns.discourse.group/u/josephmure)\ **Post date:** [October 8, 2020, 8:57am UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/8 "2020-10-08T08:57:35Z")
My real goal is in fact to turn an OpenTURNS Interval into a numpy array. In fact, what I initially tried was `arr = np.array(interval) ` which of course doesn’t work. Having `arr = np.array(ot.Sample(interval))` work would be good for me, but I think `arr = np.array(ot.Sample([interval.getLowerBound(), interval.getUpperBound()]))` is really long… ---
**Author:** ![sofianehaddad](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/sofianehaddad/32/46_2.png) [@sofianehaddad](https://openturns.discourse.group/u/sofianehaddad)\ **Post date:** [October 19, 2020, 8:09pm UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/9 "2020-10-19T20:09:51Z")
Agreed with @schueller : no need to have a new method or ctor. If you usually needs such transformation within your applications, I suggest you overload the `Interval` class when loading `openturns` for example ```python import openturns as ot def interval_to_sample(interval): return ot.Sample([interval.getLowerBound(), interval.getUpperBound()]) ot.Interval.asSample = interval_to_sample ``` In that way, we get a new method that suits your needs … ```auto interval = ot.Interval(0.6, 1.2) print(interval.asSample()) ``` ---
**Author:** ![josephmure](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/josephmure/32/114_2.png) [@josephmure](https://openturns.discourse.group/u/josephmure)\ **Post date:** [October 20, 2020, 7:41am UTC](https://openturns.discourse.group/t/export-ot-interval-to-2-point-sample/36/10 "2020-10-20T07:41:29Z")
Thanks @sofianehaddad for the tip. Perhaps I should have stated the true goal of this request immediately: to convert array-like OpenTURNS objects to numpy arrays. This is easy to do for `Sample` objects (`arr = np.array(mySample)`) and that is the reason why I asked for a way to convert `Interval`s to `Sample`s. Wouldn’t it be great to able to simply write `arr = np.array(myPoint)` or `arr = np.array(myInterval)` though? This way it would become easier to feed OT results to other Python libraries.