Can any one suggess me the code to write this equation in LaTeX.
[Tex/LaTex] Typesetting a function defined by case analysis
casesmath-mode
Related Solutions
Without an image of exactly how you want this typeset it is difficult to know for sure, but perhaps one of these is what you are looking for:
or perhaps:
\documentclass{book}
\usepackage{amsmath}
\newcommand{\fib}{\mathrm{fib}}
\begin{document}
\begin{align*}
&\text{if } x < 2 & \fib X &= 1 \\
&\text{otherwise } & \fib X &= (\fib (X - 1)) + (\fib (X - 2))
\end{align*}
Another option is:
\begin{align*}
\fib X = \begin{cases}
\text{if } x < 2 & = 1 \\
\text{otherwise } & = (\fib (X - 1)) + (\fib (X - 2))
\end{cases}
\end{align*}
\end{document}
Here is how you can modify the given MWE to obtain better spacing:
Notes:
@{}is used to eliminate the inter column spacing- I added
{}before the=to get proper math spacing. - I replaced the
$$ ... $$with\[ ... \]. See Why is \[ ... \] preferable to $$ ... $$? for more details. Changes as per egreg's suggestions:
\mathit{foreign},\mathit{time\_of\_call}and\mathrm{head}for better appearance of the formulas.- Removed
\,after\prodtime, and the other uses of\operatorname.
Code:
\documentclass{article}
\usepackage{amsmath}
\newcommand{\prodtime}{\operatorname{prodtime}}
\begin{document}
\[
\begin{array}{l l @{}l}
\prodtime V & X = Y &{}= 0 \\
\prodtime V & X = f(\ldots) &{}= 0 \\
\prodtime V & p(X_1,\,\ldots,\,X_n) &{}= \prodtime V\,(\operatorname{body} p) \\
\prodtime V & V = \,f(X_1,\,\ldots,\,X_n) &{}= \prodtime V\,(\operatorname{body} f) \\
\prodtime V & X_0(X_1,\,\ldots,\,X_n) &{}= \mathit{time\_of\_call} \\
\prodtime V & m(X_1,\,\ldots,\,X_n) &{}= \mathit{time\_of\_call} \\
\prodtime V & \mathit{foreign}(\ldots) &{}= 0 \\
\prodtime V & G_\mathrm{head},\,G_\mathrm{tail}
\end{array}
\]
\end{document}
Only use one ampersand, &.
See page 68 in lshort: https://tobi.oetiker.ch/lshort/lshort.pdf
Example:
\begin{equation*}
|x| = \begin{cases}
-x & \text{if } x < 0,\\
0 & \text{if } x = 0,\\
x & \text{if } x > 0.
\end{cases}
\end{equation*}
Produces:
Best Answer
You can make use of
mathtoolsand itscases*environment.The environments
cases*anddcases*handles the second column as text, so you wont have to manually "escape" mathmode to typeset the text correctly. Thedcases*variant use displaystyle math in the first column, which will make no difference in your situation. See section 3.4.3 in the package documentation for more details.If you want to remove the equation number (1), you can use
\begin{equation*} ... \end{equation*}instead of\begin{equation} ... \end{equation}.