# Writing Equation in Blogger using LaTeX - Mathtex3.js

• Using WYSIWYG Equation editor and Mathtex3.js for Beginner User
Creating LaTeX renderer for Blogger
For inserting an equation to a posting in a simple way, we need to make sure that LaTeX code can be rendered in the blog. Please follow the steps bellow:
- Copy (to clipboard) the following script using block and ctrl-c

<script src="http://www.watchmath.com/cgi-bin/mathtex3.js" type="text/javascript"></script>
<script type="text/javascript">
replaceMath( document.body );</script>



- Add a HTML/Script footer Gadget by accessing your Dashboard and choose Layout>>Page Element, and then click the hyperlink Add a Gadget in the bottom of the layout, followed by selecting HTML/JavaScript gadget. In the popup windows paste the script which is copied before, so that it is like the picure bellow:
Click save with out typing any title. Then save the Page Elements.

Creating WYSIWYG Equation Editor
Latex code is quite complex to remember because it is like programming script. Since we prefer works in the GUI environment, we need WYSIWYG (What You See Is What You Get) Equation Editor. The steps bellow will show you how to make a Blogger Gadget for equation editor:
- Copy the following script:

<script type="text/javascript" src="http://latex.codecogs.com/editor.js"></script>
<p align="center" style="margin-top: 0; margin-bottom: 0"><font face="Arial">
Sample:
<a href="javascript:OpenLatexEditor('testbox','latex','')">
<img src="http://www.codecogs.com/gif.latex?\sum_{i=1}^{n}{(X_i - \overline{X})^2}"
align="middle" /></a></font></p>
<p align="center" style="margin-top: 0; margin-bottom: 0"><b><font face="Arial">
<a href="javascript:OpenLatexEditor('testbox','latex','')">
Launch
Editor</a></font></b></p>
<p align="center" style="margin-top: 0; margin-bottom: 0">
<textarea id="testbox" rows="10" cols="20"></textarea></p>
<p align="center" style="margin-top: 0; margin-bottom: 0">
<a href="http://www.codecogs.com" target="_blank">
<img src="http://www.codecogs.com/images/poweredbycc.gif" border="0"
title="CodeCogs - An Open Source Scientific Library"
alt="CodeCogs - An Open Source Scientific Library" /></a>
<p style="margin-top: 0; margin-bottom: 0" align="center"><font size="1"><font face="Arial">
<a href="http://a2mstats.blogspot.com/">Aam Sudrajat</a></font> </font>
</p>



- Paste the copied script in the content, and you can give Equation Editor as the Title.
- Save the gadget and the Page Elements.

Inserting LaTeX code in a Posting
Because the equation editor is not embedded in the posting editor, we should keep the page contained it and open a new window/tab for creating/editing a posting. Then follow these steps:
- Open Equation Editor by clicking the Lauch Editor link.

- Create an equation by click the symbol or samples of equation

- Click Copy to Document, the the windows will directly change to the main page where the equation editor gadget is.

- Copy the code from the box by blocking and copying
- Paste the code to the posting editor either in Compose or Edit HTML mode.
$x = a_0 + \frac{1}{a_1 + \frac{1}{a_2 + \frac{1}{a_3 + a_4}}}$

• Using Mathtex3.js for Advanced User
Basically all the $L^{A}T_{E}X$ code can be used in a posting after adding a HTML/Script footer Gadget containing Mathtex3.js. You may read Short Math Guide for LATEX  for looking up the type set.Here some example codes:

\frac{{\displaystyle\sum\nolimits_{n> 0} z^n}}{{\displaystyle\prod\nolimits_{1\leq k\leq n} (1-q^k)}}

$\frac{{\displaystyle\sum\nolimits_{n> 0} z^n}}{{\displaystyle\prod\nolimits_{1\leq k\leq n} (1-q^k)}}$

V = \frac{k_2{[E]}+{[S]}}{K_m + {[S]}}}
$V = \frac{k_2{[E]}+{[S]}}{K_m + {[S]}}$

6CO_2 + 6H_2O \xrightarrow{Light Energy} C_6H_{12}O_6 + CO_2 \ \delta G^{\circ} = +2870kJ/mol
$6CO_2 + 6H_2O \xrightarrow{Light Energy} C_6H_{12}O_6 + CO_2 \ \delta G^{\circ} = +2870kJ/mol$

Sources:
Codecog (2009). LaTeX Equation Editor v2.96 Installation. Retrieved 15 April, 2010, from http://www.codecogs.com/latex/install.php

Downes, M. (2002). Short Math Guide for LATEX. Retrieved 15 April, 2010, from ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf

WatchMath (2010). How To Install Latex On Blogger/Blogspot. Retrieved 15 April, 2010, from http://watchmath.com/vlog/?p=438
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nikk said...

hai
verry nice tutorial

how to post the java script code with slider inside your tutorial

nik

SARiX said...

Hi , thank you very much for your tutorial , i want to know how to remove annoying borders of a latex equation : check my post http://safaelmarwa.blogspot.com/2010/10/blog-post_26.html

Joey Dumont said...

First of all, thanks a lot for this!

I also have the annoyng borders problem. Any ideas!

pkl said...

@SARiX: Go to your template and find: .post img{border: n px ....}. You replace "n" by "0".

SARiX said...

@pkl : Thanks for reviving and answering , gonna ty this :-)

pkl said...

My blogspot: http://gopnhatlinhtinh.blogspot.com/

SARiX said...

@PKL : Your tip is working fine man , check it here : My post , but i wonder if this is gonna affect something else because i had :
.post img, table.tr-caption-container {
border:1px solid $bordercolor; } which i changed to : .post img, table.tr-caption-container { padding:4px; border:0px; } pkl said... This comment has been removed by the author. pkl said... This comment has been removed by the author. pkl said... @SARiX: I think you can split .post img, table.tr-caption-container { padding:4px; border:1px solid$bordercolor;
}

into:

.post img {