Ubuntu – Scientific diagram drawing software

diagramsoftware-recommendationvector-drawings

I want to draw mathematical pictures like graphs but just simple ones like a quick sketch of an exponential decay crossing at a point marked A or something like that, and I want to draw a picture of a diagram of some equipment, like a lens and a light ray being sent through a pinhole and projected onto a screen. Diagrams like this:
Picture of what I want to draw, but I want it neater

But so they look more like this:
Wikipedia picture of circuit
and:
Wikipedia picture of lens diagram

Is there any software on Ubuntu that'll let me do this easily and accurately?

Best Answer

I would suggest KiCad. It is an application that helps you create professional schematics and printed circuit boards.

enter image description here

You can easily install it by adding the following PPA to your system:

sudo add-apt-repository ppa:adamwolf/kicad-testing-daily
sudo apt-get update
sudo apt-get install kicad kicad-doc-en
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