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Numerics,and a block diagram

Scilab's console and Xcos, on an Ubuntu desktop of your own.Compute in the language, or draw the system and simulate it.

Scilab 2024.1.04 cores · 8 GBOpens in a browser tab

hub://scilab

$ dxflow workflow create --identity scilab hub://scilab --start --link

01Pick a machinecores, memory and a rate per hour

02Create the workflowpulled from the hub, once

03Run it, then stopstopped when the work is done

The application

A console,and a canvas

Scilab is the language; Xcos is the same maths as blocks and wires.

The console

Matrices, signal processing, control design and optimization, interactively.

Xcos diagrams

Model a dynamic system as blocks, then simulate it without writing the loop.

Figures you keep

Plots export to the volume, so the next run starts from the last result.

How you run it

Every defaultis one override away

The session reads its settings from the environment, so you set them on the start line.

VNC_PASSWORDWhat the tab asks for. It ships as dxflow, and everyone reading this knows that.

PANEL and TASKBARBoth hidden, so the console has the whole screen. Show either one when Xcos opens more windows than you can find.

AUDIOOff here. Turn it on and the desktop sound is streamed beside the picture.

start it your way

$ dxflow workflow start scilab --override env.app.VNC_PASSWORD=something-long

$ dxflow workflow start scilab --override env.app.PANEL=show --link

The session

The consolefills the screen

Streamed to your browser, with Scilab already maximized.

6082Browserin the tab, at /vnc.html

5901VNCin a native client

/volumeStorageyour files, kept between runs

Open it from anywhereStart with --link and the session comes back on an HTTPS address.

Set a password firstVNC_PASSWORD defaults to dxflow, and everyone can read this page.

Good to know

Xcos opensits own windows

The console is maximized, but the block-diagram modeller does not stay inside it.

Show the panel for Xcos

A diagram, a palette and a scope are three windows. PANEL=show gives you the decorations to move between them.

Built on Ubuntu

Void has no Scilab package, so this entry sits on the Ubuntu desktop rather than the usual smaller base.

Scripts and diagrams persist

Keep your sce files, diagrams and exported figures under /volume and the next start picks them up.

The image

Pulled once,then it stays

Scilab arrives as one image. This is what comes down the first time, and what the disk should have free for it.

784Mamd64compressed, the way the registry counts it

767Marm64compressed, the way the registry counts it

20GOn diskunpacked, with room to work beside it

ghcr.io/dxflow-ai/scilab:latestPublished from the hub, pulled on the first start and kept for the ones after it.

Either architectureamd64 and arm64 are both published, and the machine pulls the one it runs.

What it asks for

What it wants,and what it needs

The definition asks for 4 cores and 8 GB. The image comes up on less than that, and a start given --fit trims the ask to whatever the machine actually has.

4 cores · 8 GBAsks forwhat the definition writes down

2 cores · 4 GBRuns onthe least the image comes up on

Not neededGPUit works on the cores alone

The ask is not the floorThe definition writes down what suits the work. The image itself starts on less, which is what the second figure is.

--fit caps it to the hostA start given --fit trims each step to what the machine actually has, for that start alone. The definition is never rewritten.

Machines that fit it

Scilab asks for 4 cores and 8 GB. Cheapest first.

E2 Standard-4

$0.168/ hour4 cores · 16 GBStart this machine

T4g XLarge

$0.168/ hour4 cores · 16 GBStart this machine

C7g XLarge

$0.181/ hour4 cores · 8 GBStart this machine

Run Scilab on your own machinePick a machine that meets it, and it opens about a minute after you ask.

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