#How to make a histogram in transcad full size
#How to make a histogram in transcad full
#How to make a histogram in transcad software
#How to make a histogram in transcad series
#How to make a histogram in transcad windows

#How to make a histogram in transcad software

I have little experience with peer software like TransCAD or CUBE, but IвЂ™ve heard that EmmeвЂ™s advantages over those include: (While IвЂ™ve complained here about the unmodernized parts of Emme 3, the GUI front-end was modernized and was on an equal footing with peers of its era like ArcGIS.)

A domain-specific GUI and graphing system.

Ready-made implementations of most of the standard operations youвЂ™ll need, like traffic and transit assignment, management of park & ride demand, etc.

A data model that includes transit lines.

So why did people put up with this, instead of just using a normal GIS system вЂ“ say a Python+PostGIS combination? Like with any domain-specific language, you have to consider the trade-offs against a general-purpose system, and IвЂ™d describe four main reasons: You can do it, but roll up your sleeves and write a lot of comments. The whole experience felt a lot like programming DOS batch files, or working in assembly language. The global variables were also painful: a small set of floating-point registers, no scope management when calling between macros, and painful string operations.

Unfortunately, mfвЂќttawq6вЂі wasnвЂ™t really enough to clearly define вЂњam weighted travel time for the home-station leg of commuter rail tripsвЂќ. Matrices and per-node/edge data were the rare exception вЂ“ you can refer to them using a six-character name. The macro language offered no arithmetic operators to let you work with numerical IDs. Most of these were accessed by numerical IDs, not by name вЂ“ mf123 is an origin-destination matrix with ID 123.

origin-destination data such as matrices.

a map represented as a graph of nodes and directed edges, with per-node and per-edge custom data.

The data model is pretty straightforward, mostly:

#How to make a histogram in transcad series

If matrix mf13 doesnвЂ™t exist, youвЂ™ll get a different series of questions. A particular delight is that the sequence of menu questions is state-dependent, with no easy way to predict whether an extra confirmation will pop up in any given situation. Perfectly legible вЂ“ a nice, succinct way to say вЂњI deleted a matrix!вЂќ, right? The menus themselves are mostly in the manual, and theyвЂ™re mostly consistent between software versions. Or, if you took advantage of the shorthand notation, you could instead say ~+|3.12|2|mf13|y|q Then your вЂњsource codeвЂќ would look like this: 3.12 If your interactive session looked like this, with user input shown in red:ДЈ.12 Input / modify matrices interactivelyДЈ.12В InputВ /В modifyВ matricesВ interactively And вЂ“ the kicker вЂ“ the programming/macro language is actually just a recording of a menu session.

#How to make a histogram in transcad full

Emme 3 was the awkward teenage years, when the transformation to full adulthood wasnвЂ™t quite complete yet.ДЄnalysis and database management in Emme 3 was still entirely a 1980s experience, driven by a console menu system. This article is about masochistic techno archaeology, not productivity. Emme fully modernized: an Emme 4 session with the IPython NotebookД«ut IвЂ™m going to talk today about the earlier intermediate version, Emme 3. ItвЂ™s now a pleasure to use вЂ“ a shiny, modern and easy-to-use front-end with a very powerful core under the hood. The revival gained steam with 2012вЂ™s Emme 4 вЂ“ which began to repackage the core algorithms with both a Python API and GUI, including IPython Notebook.

#How to make a histogram in transcad windows

The vendor belatedly added a real interactive GUI with 2007вЂ™s Emme 3, offering a Windows interface on top of an unchanged command-line core.

#How to make a histogram in transcad full size

In raw computing power, it is more powerful than a full size VAX 11/780 and is 3 times faster than the already astonishing DSI-32.вЂќД«y the early 2000s, the vendor had misguidedly put energy into a basic Unix GUI, just as the final users abandoned Unix. вЂњThe first computational tests show that the DSI-780 beats even our most optimistic expectations. The later shift to DOS was in the pre-486 era when CPUs didnвЂ™t have floating-point capabilities and required a separate co-processor chip or board, as this 1986 press release hypes:

Like any early 80s software, the original version is old enough that IвЂ™ve never even heard of the hardware: it was implemented on the Pixel 100/AP Supermicro, a 32-bit 68000 based UNIX workstation. But it clearly missed the Windows boat the software seems to have stagnated until beginning a revival in the late 00s.

During the years that I worked in travel demand forecasting, this was the main tool available to me.Д®mme was undoubtedly a trailblazing innovator when it first came out in 1982 and remained a power userвЂ™s dream through to the early 90s. Imagine thereвЂ™s no usable string processing. Imagine that all commands are just numbers. Imagine working вЂ“ in 2016 вЂ“ with registers.