Inkscape Extension ‘svg2tikz’ revisited.

In this earlier posting, I had written about the low-performing 3rd-party Inkscape Extension known as ‘svg2tikz’. Nevertheless, this extension may prove useful to some users, who wish to import an arbitrary document-type into Inkscape – preferably vector-based – and who wish to convert that into LaTeX in some way. And it seems that, even though this project was abandoned some time ago, work has slowly begun to resume on its source-code. And so, I should also fine-tune some of the earlier commentary I had made about this extension.

First off, there is an important detail about how to compile and install this extension, which its devs fail to point out anywhere. It needs to be built and installed, using Python 3, while many Linux computers still default to Python 2.7. Therefore, the commands to build and install it are:

 


$ python3 setup.py build
$ su
(...)
# python3 setup.py install

 

If one neglects this detail, then Unicode support is left out, and usually, SVG Files etc., will contain some Unicode characters. Further, as the Github comment states, while the importing of raster-based images is now supported, their import as Base-64 encoded, inline data is not. Therefore, within Inkscape, for example if a PDF File is being imported, the option needs to be unchecked, to ‘Embed’ graphics. And when Saving a Copy to TiKz Format, the option should also be unchecked, to ‘Indent Groups’.

But this last detail leads me to an important, additional observation. I have always known that the export of Text with the Figure has been dodgy. But lately, either because I’ve become more observant, or, because the behaviour of the latest version of the extension has improved, I’ve noticed what, exactly, goes wrong with Exporting Text along with the Figure.

(Updated 2/11/2020, 1h05 … )

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Some Observations about Roots with Multiplicities.

One of the subjects which I had visited in my past, was to write a C++ program that approximates the roots of polynomials, but that needed to deal with ‘Doubled Roots’ in a special way, just because the search algorithm within that program, which searches for the roots, cannot deal with doubled roots. And what I found was, roots cannot only be doubled, but can have multiplicities higher than (2). After not having pondered that programming project from the past, for some time, I now come back to rethink it, and find that it can be given a lecture of sorts, all to itself.

So, this is a link to a work-sheet, in which I try to explain Roots with Multiplicities, maybe to people with limited knowledge in Calculus:

Link to Letter-Sized PDF

Link to EPUB File, for viewing on Mobile Devices

And as those two documents mention, the following is a link to the earlier blog posting, from which readers can download the C++ program, as well as to find instructions on how to compile it, on Linux computers:

Link to Earlier Blog Posting

Hence, the C++ program linked to in the earlier blog posting, needed to make use of the subject, that the two PDF Files describe.

N.B.:

(Updated 5/06/2019, 13h15 … )

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A simplified way to insert TikZ graphics into actual documents.

One of the observations I seem to be making is, that the technology-intensive part of the world is still using such tools as LaTeX, to typeset documents and vector-based graphics, such as Mathematical equations which I’ve included in previous parts of this blog, even though we know that GUI-based applications have existed for some time, that also typeset and do graphics…

I like ‘LaTeX’, even though I never learned the full syntax. LaTeX defines the document in a type of textual syntax. And there is even a system of TeX macros, which defines a sub-language called “TikZ”, that defines entire figures, sketches and plots, using a textual syntax.

Edit: Alternatively, there is a sub-language called “PSTricks”, which offers yet another way to do the same thing

And so a question which strikes me as important is, how to use these languages, even though I don’t know the syntax. And the answer is, ‘I use a GUI.’ That GUI mainly consists of the application ‘LyX’.

(Updated 3/07/2019, 17h55 … )

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How the EPUB2 and MOBI formats can be used for typeset Math.

According to This preceding posting, I was experiencing some frustration over trying to typeset Math, for publication in EPUB2 format. EPUB3 format with MathML support was a viable alternative, though potentially hard on any readers I might have.

Well a situation exists in which either EPUB2 or MOBI can be used to publish typeset Math: Each lossless image can claim the entire width of a column of text, and each image can represent an entire equation. That way, the content of the document can alternate vertically between Text and Typeset Math.

In fact, if an author was to choose to do this, he or she could also use the Linux-based solutions ‘LyX’ , ‘ImageMagick’ , and ‘tex4ebook’ .

(Edited 1/9/2019, 15h35 … )

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