# Error in chapter 2 bayes filter

**URL:** <https://get-help.theconstruct.ai/t/error-in-chapter-2-bayes-filter/18964>\
**Category:** Kalman Filters\
**Tags:** error\
**Created:** [August 30, 2022, 3:43pm UTC](https://get-help.theconstruct.ai/t/error-in-chapter-2-bayes-filter/18964 "2022-08-30T15:43:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jokerr](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/j/f6c823/32.png) [@jokerr](https://get-help.theconstruct.ai/u/jokerr)\
**Post date:** [August 30, 2022, 3:43pm UTC](https://get-help.theconstruct.ai/t/error-in-chapter-2-bayes-filter/18964/1 "2022-08-30T15:43:07Z")

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belief = predict\_step(belief, movement\_data.data, kernel)

 ![屏幕截图 2022-08-30 233120](https://get-help.robotigniteacademy.com/uploads/default/original/2X/4/448ae06a8828b1720dabc9e99cfc8b92fa0a1cea.png)

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**Author:** ![rzegers](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/rzegers/32/7010_2.png) [@rzegers](https://get-help.theconstruct.ai/u/rzegers)\
**Post date:** [September 1, 2022, 9:34pm UTC](https://get-help.theconstruct.ai/t/error-in-chapter-2-bayes-filter/18964/2 "2022-09-01T21:34:37Z")

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Hello @jokerr,  
you are correct, the line of code should be  
`belief = predict_step(belief, movement_data.data, kernel)`  
I have corrected the mistake, many thanks for reporting it.

Cheers,

Roberto

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**Author:** ![bayodesegun](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/bayodesegun/32/10684_2.png) [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\
**Post date:** [September 5, 2022, 8:13am UTC](https://get-help.theconstruct.ai/t/error-in-chapter-2-bayes-filter/18964/3 "2022-09-05T08:13:55Z")

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