# Efficient creation of power series matrix or array of arrays

**URL:** <https://discourse.julialang.org/t/efficient-creation-of-power-series-matrix-or-array-of-arrays/18988>\
**Category:** Performance\
**Tags:** question\
**Created:** [December 26, 2018, 1:32am UTC](https://discourse.julialang.org/t/efficient-creation-of-power-series-matrix-or-array-of-arrays/18988 "2018-12-26T01:32:49Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![areida](https://avatars.discourse-cdn.com/v4/letter/a/57b2e6/32.png) [@areida](https://discourse.julialang.org/u/areida)\
**Post date:** [March 27, 2019, 8:19pm UTC](https://discourse.julialang.org/t/efficient-creation-of-power-series-matrix-or-array-of-arrays/18988/21 "2019-03-27T20:19:01Z")

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Oh, right, my bad.

Thank you so so so much. It works now! 🙂

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**Author:** ![dpsanders](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dpsanders/32/3573_2.png) [@dpsanders](https://discourse.julialang.org/u/dpsanders)\
**Post date:** [March 27, 2019, 11:24pm UTC](https://discourse.julialang.org/t/efficient-creation-of-power-series-matrix-or-array-of-arrays/18988/22 "2019-03-27T23:24:19Z")

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You can type `len<TAB>` to use auto-completion so that you can avoid this problem.

[I have noticed that Spanish speakers very frequently write `lenght` instead of `length`. I haven’t worked out why that might be, nor how to help them unlearn that.]

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**Author:** ![areida](https://avatars.discourse-cdn.com/v4/letter/a/57b2e6/32.png) [@areida](https://discourse.julialang.org/u/areida)\
**Post date:** [March 28, 2019, 9:11am UTC](https://discourse.julialang.org/t/efficient-creation-of-power-series-matrix-or-array-of-arrays/18988/23 "2019-03-28T09:11:12Z")

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Thanks for tip, I’ll use it!

[I’m not Spanish speaker, but it was a typo and I didn’t see difference between my original code. And, it could because f.e different words has similar end - " thought, lightweight", For someone who is just intemediate it’s not a big difference, unfortunately :(]

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**Author:** ![longemen3000](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/longemen3000/32/7298_2.png) [@longemen3000](https://discourse.julialang.org/u/longemen3000)\
**Post date:** [March 29, 2019, 7:24am UTC](https://discourse.julialang.org/t/efficient-creation-of-power-series-matrix-or-array-of-arrays/18988/24 "2019-03-29T07:24:50Z")

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Spanish speaker here, I don’t know, but maybe it has something to do with the fact that in Spanish we have don’t use the - th sound

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