Matrices in LaTeX not displaying
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I am writing a math post which includes some matrices; the LaTeX code should look something like
$latex left(begin{array}{cc}1&2\ 3&4end{array}right)$which is legitimate LaTeX. But after saving, all the ampersands are turned into
&which is not what I want at all, and the formula fails to be typeset.I am using the Digg 3 Column theme.
Does anybody know how I can produce matrices for display in wordpress.com?
Thanks,
Alasdair -
Alasdair,
I just tried your LaTeX code in a draft post, and it works correctly (while I’m using a different theme, that shouldn’t make any difference since the LaTeX rendering process produces images…)
Are you seeing the & character entity in the visual or HTML view when you’re editing your post?
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I am using the plain HTML editor – which is where the ampersands are changed to
&after saving. Interestingly enough, the example matrix in my original post typesets fine, but the larger 4 by 4 matrices which I really want don’t typeset at all.So in my post, when I preview it, instead of a nice matrix equation, I get the LaTeX code instead.
Thanks,
Alasdair -
I don’t think the & representation in the HTML view is a problem; all of my $latex LaTeX$ has that as well in HTML view. The rendering process doesn’t usually have a problem with it. That almost sounds like you accidentally wrote something like
$left(...right)$
instead of
$latex left(...right)$Can you post the code for one of the 4-by-4 matrices that isn’t rendering?
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Thanks for your help. Here is one matrix equation which is not typesetting:
$latex left(begin{array}{c}x'\ y'\ z'\ w'end{array}right)= left(begin{array}{cccc}1&0&0&0\ 0&1&0&0\ 0&0&costheta&-sintheta\ 0&0&sintheta&costhetaend{array}right) left(begin{array}{c}x\ y\ z\ wend{array}right)$For the purpose of this forum post I’ve changed all the
&back to plain&.Thanks again!
Alasdair -
It looks like you have line breaks in your LaTeX, and the WordPress rendering process doesn’t like it. I suspect that they check each line of the input for a pattern like $latex …$, and hand the … to their LaTeX rendering process to produce the images.
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You also seem to be missing a line break (\) between the third and fourth rows of the second array, which led to a “Formula does not parse” message.
:-)
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Hmmm… if I try to put everything on one line, then the editor puts a line break between
$latexand the first character of my LaTeX code. I can’t force the editor to keep one (very long!) line. I suppose I could try to switch to the enhanced editor, although I much prefer the HTML editor.This is quite tricky…!
Thanks again for your help. I’ll keep fiddling during the day – it’s now early morning here.
-Alasdair
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It may just be wrapping the line (part of how it displays the text, but no bytes in the data saying “put a line break here”), which is different than actually having a line break (which actually has one or two bytes of data saying “put a line break here”).
Good luck!
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I ended up getting round the problem by creating the equation in my own LaTeX, and uploading the result as an image. It’s a painful way to do it, because editing and changing the equation takes far longer, but at least the final result looks good:
http://amca01.wordpress.com/2008/05/15/a-really-beautiful-animation/
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Put a space after the \ and before the first 0 on the last row of the second matrix. For some reason wordpress.com replaces by &.
$latex left(begin{array}{c}x'\ y'\ z'\ w'end{array}right)=left(begin{array}{cccc}1&0&0&0\ 0&1&0&0\ 0&0&costheta&-sintheta\ 0&0&sintheta&costhetaend{array}right)left(begin{array}{c}x\ y\ z\ wend{array}right)$
works.BUT better still use the pmatrix environment which is easier to use, though you still need to put the space in on the fourth row.
$latex begin{pmatrix}x'\ y'\ z'\ w'end{pmatrix}=begin{pmatrix}1&0&0&0\ 0&1&0&0\ 0&0&costheta&-sintheta\ 0&0&sintheta&costhetaend{pmatrix}begin{pmatrix}x\ y\ z\ wend{pmatrix}$
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