Cfrgtkky

I write this math equation in mathtype first, and then convert it into latex code:

begin{block}{Membership functions Trapezoidal - Low}

[forall u in R,{rm{ }}{mu _L}(u) = left{ {begin{array}{*{20}{c}}{1{rm{  if  }}0 le u le 0,2}\{frac{{0,3 - u}}{{0,1}}{rm{ if }}0,2 < u < 0,3}\{0{rm{ if u}} ge 0,3}end{array}} right.]

end{block}

However, as you can see, the display is not the same. So how can I fix this issues? Thanks

Don't use MathType to write equations: the code it generates is awful and, in some cases, plainly wrong.

For instance, the command rm has been deprecated for well over twenty years.

Here's a suggestion with a two-column array: the first column is center aligned and in displaystyle; the second column is left aligned and in text mode.

documentclass{beamer}

usepackage{mathtools,array}



usetheme{Warsaw}



begin{document}



begin{frame}

frametitle{A test}



begin{block}{Membership functions Trapezoidal - Low}

[

forall u in R,quad

mu_L(u) =

begin{cases}

begin{array}{@{} >{displaystyle}c >{$}l<{$} @{}}

1 & if  $0 le u le 0{,}2$ \[1ex]

frac{0{,}3 - u}{0,1} & if $0{,}2 < u < 0{,}3$ \[2ex]

0 & if $u ge 0{,}3$

end{array}

end{cases}

]

end{block}



end{frame}



end{document}

Note how to avoid the unwanted space after the comma in numbers.

You can change the array function to have three entries. For example the following code:

begin{equation}

forall u in R,{rm{ }}{mu _L}(u) = left{ begin{array}{lll}1&;;{rm{  if  }}&;;0 le u le 0,2\ frac{0,3 - u}{0,1}&;;{rm{ if }}&;;0,2 < u < 0,3\0&;;rm{ if } &;;uge 0,3end{array} right.

end{equation}