# Why is numberOfGridNodesInOneDimension not equal to meshsize in BSpline transformation?

**URL:** <https://discourse.itk.org/t/why-is-numberofgridnodesinonedimension-not-equal-to-meshsize-in-bspline-transformation/495>\
**Category:** Algorithms\
**Created:** [December 8, 2017, 10:56pm UTC](https://discourse.itk.org/t/why-is-numberofgridnodesinonedimension-not-equal-to-meshsize-in-bspline-transformation/495 "2017-12-08T22:56:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ray](https://discourse.itk.org/letter_avatar_proxy/v4/letter/r/e9a140/32.png) [@Ray](https://discourse.itk.org/u/Ray)\
**Post date:** [December 8, 2017, 10:56pm UTC](https://discourse.itk.org/t/why-is-numberofgridnodesinonedimension-not-equal-to-meshsize-in-bspline-transformation/495/1 "2017-12-08T22:56:39Z")

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Why is numberOfGridNodesInOneDimension not equal to meshsize in BSpline transformation? The example code shows numberOfGridNodesInOneDimension = SplineOrder + meshSize (of one dimension). Why do we have this?

unsigned int numberOfGridNodesInOneDimension = 5;  
meshSize.Fill( numberOfGridNodesInOneDimension - SplineOrder );

Thanks!

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**Author:** ![Ray](https://discourse.itk.org/letter_avatar_proxy/v4/letter/r/e9a140/32.png) [@Ray](https://discourse.itk.org/u/Ray)\
**Post date:** [December 10, 2017, 5:53am UTC](https://discourse.itk.org/t/why-is-numberofgridnodesinonedimension-not-equal-to-meshsize-in-bspline-transformation/495/2 "2017-12-10T05:53:04Z")

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I misunderstood some terms. Never mind…