| 6 Nov 2023 |
 Hannes | So when I use jupyter I'm constantly restarting the kernel and rerunning all the cells from top to bottom | 03:28:22 |
| Hannes | Pluto just does all that for me automatically, and without rerunning stuff that hasn't changed! | 03:28:54 |
 🪐 | Thanks for sharing! | 14:15:51 |
| 7 Nov 2023 |
 Andreas Weh | Pluto plays also much nicer with `git`.
Jupyter got much better with the latest major release. But for teaching and short running things I still prefer Pluto. | 21:13:45 |
 qwjyh | Pluto with PlutoUI is a really great framework for small interactive application. Unlike jupyter, cell ordering doesn't affect execution ordering, so you can put use interfaces at the top and logics later. | 21:25:46 |
| qwjyh | * Pluto with PlutoUI is a really great framework for small interactive application. Unlike jupyter, cell ordering doesn't affect execution ordering, so you can put user interfaces at the top and logics later. | 21:26:06 |
| 12 Nov 2023 |
|  Andre Goios joined the room. | 06:12:20 |
| 13 Nov 2023 |
| 🪐 changed their display name from ericjmorey to 🪐. | 00:33:02 |
| 🪐 changed their profile picture. | 16:33:01 |
|  Tux joined the room. | 19:15:02 |
| 14 Nov 2023 |
| Tux | Hi everyone | 07:52:18 |
| Hannes | Hi Tux! | 09:02:09 |
| 15 Nov 2023 |
|  rollskatflat joined the room. | 10:36:56 |
| rollskatflat | Hi, I am new to Julia, but have done plenty of MATLAB and scientific Python in my time.
I am just trying to understand how to vectorise an execution.
a .* b works just fine.
But now I have created a Vector{SVector} from the Rotations.jl package
I have used
push!(myVec, mySVec)
To build the data structure | 10:41:03 |
| rollskatflat | I then create a rotation matrix using QuatRotation, to create the quaternion.
myQuat * myVec[1]
Returns a result as expected
As do all subsequent indices
But, when I go
myVec .* myQuat | 10:42:39 |
| rollskatflat | DimensionMismatch: arrays could not be broadcast to a common size | 10:43:21 |
| rollskatflat | My guess is SVector is actually a static Vector and the .* Is trying to do an element wise multiply across the two, rather than treating myVec as a single value. | 10:53:33 |
| qwjyh | .* treated Vector{SVector} as you want.
In this case, myQuat is also broadcasted and cause dimension mismatch.
To handle this correctly, you need to wrap myQuat with Ref.
julia> Ref(my_quat) .* my_vec
5-element Vector{SVector{3, Float64}}:
For more information, see .* (and broadcast) in the help mode.
| 14:00:38 |
| qwjyh | * .* treated Vector{SVector} as you wanted.
In this case, myQuat is also broadcasted and cause dimension mismatch.
To handle this correctly, you need to wrap myQuat with Ref.
julia> Ref(my_quat) .* my_vec
5-element Vector{SVector{3, Float64}}:
For more information, see .* (and broadcast) in the help mode.
| 14:00:51 |
| qwjyh | * Indeed, .* treated Vector{SVector} as you wanted.
In this case, myQuat is also broadcasted and cause dimension mismatch.
To handle this correctly, you need to wrap myQuat with Ref.
julia> Ref(my_quat) .* my_vec
5-element Vector{SVector{3, Float64}}:
For more information, see .* (and broadcast) in the help mode.
| 15:52:44 |
| rollskatflat | Thank you so much! | 20:05:44 |
| 20 Nov 2023 |
|  Songtao Gui joined the room. | 07:11:30 |
| 28 Nov 2023 |
|  Major General David C. Hill joined the room. | 18:50:55 |
| Major General David C. Hill left the room. | 19:13:55 |
| 30 Nov 2023 |
|  finlifin left the room. | 15:34:47 |
| 1 Dec 2023 |
|  Malte E joined the room. | 10:30:28 |
| Malte E | I'm trying to convert a system from discrete to continuous, not by using d2c but by replacing z^-1 by exp(-s*T) as this provides a more accurate representation. How would I do that (for a MIMO state space system)? | 10:41:38 |
| Malte E | The best way I can think of is to separate the system in its matrices, assemble everything with a continuous instead of discrete delay and re-assign the input/output names. That's just very clunky for what should be a fairly simple operation. | 10:51:38 |
| Malte E | can I even assign input and output names to delay systems? | 10:54:54 |
| Malte E | If I could get an equivalent of setDelayModel from MATLAB, that would also suffice | 11:32:55 |
