# TypeError: non-boolean (BitArray{1}) used in boolean context

**URL:** https://discourse.julialang.org/t/typeerror-non-boolean-bitarray-1-used-in-boolean-context/25810
**Category:** New to Julia
**Created:** [June 28, 2019, 2:29pm UTC](https://discourse.julialang.org/t/typeerror-non-boolean-bitarray-1-used-in-boolean-context/25810 "2019-06-28T14:29:02Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![aaron](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@aaron](https://discourse.julialang.org/u/aaron)
#### Post date: [June 28, 2019, 2:29pm UTC](https://discourse.julialang.org/t/typeerror-non-boolean-bitarray-1-used-in-boolean-context/25810/1 "2019-06-28T14:29:02Z")

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Hi, I am a newbie in Julia, using version 1.1.1.

TypeError: non-boolean (BitArray{1}) used in boolean context

What’s wrong with the following code?

x1 = collect(0:0.1:2)  
x2a = 1 .-0.5.\* x1  
x2b = ifelse(2 .-2\* x1 .\>=0, 2 .- 2\* x1,0)

Thanks!

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### Author: ![kristoffer.carlsson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kristoffer.carlsson/32/22_2.png) [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)
#### Post date: [June 28, 2019, 2:31pm UTC](https://discourse.julialang.org/t/typeerror-non-boolean-bitarray-1-used-in-boolean-context/25810/2 "2019-06-28T14:31:53Z")

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This is exactly the same as the answer in [MethodError: no method matching -(::Int64, ::Array{Float64,1}) - #3 by aaron](https://discourse.julialang.org/t/methoderror-no-method-matching-int64-array-float64-1/25806/3).

`ifelse` works on scalars so if you want to do it elementwise use the dot syntax, `ifelse.(...)`.

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### Author: ![aaron](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@aaron](https://discourse.julialang.org/u/aaron)
#### Post date: [June 28, 2019, 2:33pm UTC](https://discourse.julialang.org/t/typeerror-non-boolean-bitarray-1-used-in-boolean-context/25810/3 "2019-06-28T14:33:15Z")

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Thank you again!