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At Flytrex, in order to ensure drones fly only where allowed, and do not collide with each other, they are allowed to fly only in preplanned paths. However, if our goal is to deliver food to backyards, we can’t have a predefined path from our delivery center to each back yard, that would be wasteful.…

I’ve been learning German for quite some time now. Some months ago, it came to the point where I was stuck – in order to progress I had to learn the German cases by heart. It’s not a lot of data, and being able to understand it is relatively straightforward, however knowing it actively as…

Over the last weekend I felt like programming something fun and easy, so I thought, why not write yet another pandemic/epidemic simulation. So between helping a crying child and preparing lunch, I created simpandemic. It’s small, simplistic, but easy to play with and change parameters. As a toy project, it’s far from perfect. I implemented…

So apparently almost all of the developers in the world are using stackoverflow. However many developers just use StackOverflow to lookup answers, and rarely to ask their own questions. Answering other people’s questions is of course rarer still. Up until recently I was the same: I wrote a few questions in StackOverflow, and even answered…

So apparently my last blog post was from 2012. That’s quite a bit of time. Since then I’ve: Had a son Sold my startup Desti to HERE Moved with my family to Boston Moved back to Israel, join Cymmetria, first as VP R&D and later as CTO Had another son Left Cymmetria and joined Flytrex…

While working on my new startup, we are doing a little bit of reasoning using implications. One of the more curious forms of implications is the negative form: consider the following exaggerated example: a place being kid-friendly implies that it is not romantic. a place being a strip club implies it is not kid-friendly If…

For the latest project I’m working on, we’re using Django with Postgres. I was writing some code that had to find a list of objects that weren’t processed yet. The way they were stored in the DB is like so: class SomeObject(models.Model): #some data   class ProcessedObjectData(models.Model): some_object = models.ForeignKey(SomeObject, db_index = True) #some more…

So here I was, trying to write some Django server-side code, when every once in a while, some test would fail. Now, it is important to know that we are using any_model, a cute little library that allows you to specify only the fields you need when creating objects, and randomizes the rest (to help…

Some months ago, I was facing a problem of having to deal with large amounts of textual data from an external source. One of the problems was that I wanted only the english elements, but was getting tons of non-english ones. To solve that I needed some quick way of getting rid of non-english texts.…

A few days ago a friend (x) of a friend (y) showed me and my friend (y) a small app he was developing, that had photos from flickr and picasa. We suggested adding photos from Wikipedia as well, but he (x) said that the photos were too big, and it was too much trouble resizing…