# MATLAB.jl not supporting cwt()?

**URL:** <https://discourse.julialang.org/t/matlab-jl-not-supporting-cwt/137581>\
**Category:** New to Julia\
**Tags:** package, matlab\
**Created:** [June 12, 2026, 9:01am UTC](https://discourse.julialang.org/t/matlab-jl-not-supporting-cwt/137581 "2026-06-12T09:01:08Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![mahmah](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mahmah/32/214326_2.png) [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Post date:** [June 12, 2026, 9:01am UTC](https://discourse.julialang.org/t/matlab-jl-not-supporting-cwt/137581/1 "2026-06-12T09:01:08Z")

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Hi,

I am getting no output for this:

```julia-auto
using MATLAB
mat"cwt($x)"

```

Whereas for instance this works fine:

```julia-auto
mat"fft($x)"

```

Any clues?

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<div class="post-metadata">

**Author:** ![kellertuer](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kellertuer/32/220707_2.png) [@kellertuer](https://discourse.julialang.org/u/kellertuer)\
**Post date:** [June 12, 2026, 9:50am UTC](https://discourse.julialang.org/t/matlab-jl-not-supporting-cwt/137581/2 "2026-06-12T09:50:41Z")

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Without much more detail (e.g. what the error message is) it is a bit hard to tell, but

`cwt` ([https://www.mathworks.com/help/wavelet/ref/cwt.html](https://www.mathworks.com/help/wavelet/ref/cwt.html)) is part of the [Wavelet Toolbox](https://www.mathworks.com/help/wavelet/index.html?s_tid=CRUX_lftnav), while fft ([https://www.mathworks.com/help/matlab/ref/fft.html?s\_tid=srchtitle\_support\_results\_1\_fft](https://www.mathworks.com/help/matlab/ref/fft.html?s_tid=srchtitle_support_results_1_fft)) is part of Matlab itself directly.

So one reason might be that the Matlab you have installed does not have the Wavelet Toolbox installed / included?

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<div class="post-metadata">

**Author:** ![mahmah](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mahmah/32/214326_2.png) [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Post date:** [June 12, 2026, 10:01am UTC](https://discourse.julialang.org/t/matlab-jl-not-supporting-cwt/137581/3 "2026-06-12T10:01:02Z")

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That’s not the reason, since mat"ver" shows the wavelet toolbox and mat"help cwt" gives me the help for that function. Also, I’m not getting an error here, just no output.

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<div class="post-metadata">

**Author:** ![mahmah](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mahmah/32/214326_2.png) [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Post date:** [June 12, 2026, 11:52am UTC](https://discourse.julialang.org/t/matlab-jl-not-supporting-cwt/137581/4 "2026-06-12T11:52:14Z")

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OK I found the solution: mat"[$w $f] = cwt($x)"