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2012-12-12 09:49:26 +0100 | commented answer | Can I show equations in black rather than blue? Great, thanks. You can also do it locally within a worksheet cell via: %html <style>div.cell_div_output_wrap { color: #000 }<style> |
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2012-12-06 15:24:27 +0100 | commented answer | Eliminating variables from a system of equations? My actual system of equations was a bit more complicated, but this seems to reproduce my issue. I guess I see what you're getting at. If I have m equations containing m+n free variables, then I need to "solve()" for at least m variables and, for each solution set, each variable will appear once on the left hand side, expressed in terms of the remaining n variables on the right hand side? So if I want to eliminate k variables from my system of m equations (in m+n unknowns), I should just "solve" for those k along with an arbitrary k-m other variables, and if I get a unique solution then I can replace my original system with the k-m equations corresponding to the non-eliminated variables?? Is there a way to ask Sage what variables are mentioned in an equation? |
2012-12-06 15:14:53 +0100 | asked a question | Can I show equations in black rather than blue? When I |
2012-12-06 12:05:27 +0100 | answered a question | How can hide %hide? You can also hide input cells using CSS styling. If you want to hide input cells in the interactive worksheet, add a cell at the start of the worksheet like this: %html <style> textarea.cell_input {display : none} </style> But then you need to edit the worksheet source to change %html <style> .cell_input_print {display : none} </style> |
2012-12-06 12:01:01 +0100 | answered a question | css print stylesheet Using Google Chrome, you can look at the document source for the window you get via the 'print' button, and it seems to use the same stylesheets as the editable worksheet. It's not clear to me in either case where the user-provided notebook.css gets included. Both interactive and print versions respect style commands embedded directly in the notebook with a %html <style> table.table_form * tr.row-a { background: #ffffff; } table.table_form * tr.row-b { background: #ffffff; } table.table_form * td { padding-top: 5px; padding-bottom: 5px; padding-left: 2px; padding-right: 2px; } table.table_form tr td:first-child { text-align: right; } </style> One thing I have noticed though, is that many of the elements are displayed with different CSS classes in the printed version. For example an input cell is class .cell_input in the editable worksheet, but .cell_input_print in the printed one. This is actually handy - as noted above I've been using the worksheet to write a technical note with various graphs and equations in it, so using lots of textarea.cell_input {display : none} which makes all your input cells disappear. But it's a bit painful to have to keep editing the source for the worksheet to make them .cell_input_print {display : none} I also get it to center images (like plots) in the print view by adding: .cell_output_box {width : 100%} .cell_output_print_wrap * img { display: block; margin-left: auto; margin-right: auto } I can print to PDF and I'm all set - the quality is actually pretty impressive! |
2012-12-06 11:43:37 +0100 | commented question | embed sage vars in html notebook cell Another interesting directive that I just stumbled on and didn't see documented is %hide, which seems to hide the remainder of your input cell text |
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2012-12-05 23:55:58 +0100 | asked a question | Public servers where I can publish (share) a notebook? I've spent some time preparing a notebook I planned to share with others, but it seems like publishing (or at least viewing published notebooks?) is disabled at sagenb.org. Is this a deprecated feature? I thought it would be a great way to share a "living" version of a document that keen readers could then experiment further with. I guess I could just share my .sws file but that would mean extra steps of setting up a Sage account and uploading it before messing with it. But I suppose that is a workable alternative. |
2012-12-05 23:44:30 +0100 | commented question | css print stylesheet I'd like to know the answer to this too. I've been using a trick from another question to hide all my input cells, with my html and chart outputs forming something that looks a bit like a discussion paper. But when I use print, all my input reappears! (It would also be cool to have a button or special mouseclick to be able to hide/unhide input cells one by one as you're working to produce the commentary and displayed equations/derivations etc) |
2012-12-04 22:46:22 +0100 | commented answer | Can I display a list of equations aligned like latex eqnarray? Makes sense. Tho I've started doing all my text as %html so I can use the <sage> tags and avoid the pre-formatted (fixed width) text I seem to get with html() |
2012-12-04 06:50:28 +0100 | commented answer | Can I display a list of equations aligned like latex eqnarray? That's a good idea. If you add a %html cell you can improve the styling: avoid the alternating grey rows, tighten up the spacing, and right-align the leftmost column. I used this: %html <style> table.table_form * tr.row-a { background: #ffffff; } table.table_form * tr.row-b { background: #ffffff; } table.table_form * td { padding-top: 5px; padding-bottom: 5px; padding-left: 2px; padding-right: 2px; } table.table_form tr td:first-child { text-align: right; } </style> |
2012-12-03 16:30:07 +0100 | asked a question | Can I display a list of equations aligned like latex eqnarray? I have several sage equations stored in a python list (for use in solve() etc). I'd like to display them one per line, aligned on equal signs if possible. This is in the notebook. Most things I've tried - view(), show(), pretty_print() just print something that looks like a python list of formatted equations, all on one line (although the documentation for view() claims it will print each element of a list on a separate line, that doesn't seem to be the case). The only things I've come up with are to explicitly loop, like: for eqn in eqns: view(eqn) or to pass eqns to html.table() which does one per line with alternating line shading. |
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2012-12-01 14:28:09 +0100 | answered a question | embed sage vars in html notebook cell Aha! I did some code exploration of sage/misc/html.py and discovered the %html We can see that <sage>x</sage> is the key result and it will do sage_eval() and format the result in math mode, so you get nice inline math display of the formula contained in x. That is exactly what I need - is that |
2012-12-01 07:53:18 +0100 | asked a question | embed sage vars in html notebook cell Again I feel like I'm missing something. I'm trying to add some mostly text content to a notebook cell, but I want to include an equation contained in a notebook variable. For example I have defined And then I want to write a few paragraphs that includes the formula contained in x. If I use the HTML editor and put something in dollar signs, it formats as math but doesn't eval the content, i.e. if I say $x$ then I just get a literal x in italics. If I call the html() function, I can do something like If I start a cell with Also, is there some documentation of how the different cell tags like %latex, %html, etc work? |
2012-11-30 15:54:23 +0100 | commented answer | workaround for graphics_array needing prior show? The save('/tmp/file.png') works perfectly, though I'm not sure I understand why it displays the first case but not the second (when it obviously can 'see' both files since it wrote them) - what logic does it use to decide whether to show it or not? I will have to take a look at the code. |
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2012-11-30 13:52:41 +0100 | asked a question | workaround for graphics_array needing prior show? I'm trying to use graphics_array to show a list of four simple plots. when I create the plots and display them straightaway in the graphics_array() it messes up the axis labeling and so on. I discovered via google that you can workaround that by first calling show() or save() on each of the graphs (I guess that finalizes their layout etc), and then call graphics array to combine them. But this results in each of the charts being shown individually before being shown in an array, which defeats the purpose. The closest I've found is calling save('foo.pdf') on each of the charts, since it doesn't know how to display a PDF file you only get a link to 'foo.pdf'. I guess what I'd really like is save(filename, display=False) or something? (Of course ultimately I'd like graphics_array() to do the right thing in the first place and prepare each chart individually before compositing them) Any ideas? |
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2012-11-28 19:13:42 +0100 | answered a question | Eliminating variables from a system of equations? The best approach I've found so far is to define an eliminate(vars, eqns) procedure (see below) which attempts to remove all the listed vars from the system, so that: gives [2y^2 == z] and solve(eliminate([x], eqns), z) gives me what I was after originally. But I figure I must be missing something obvious. |
2012-11-28 19:10:00 +0100 | asked a question | Eliminating variables from a system of equations? I'm (very) new to Sage, but am confused about why I can't get it to solve a simple system like this: but solve(eqns, z) gives an empty list back instead of my desired z = 2y^2 |