Math & Science ⇒ Sentence in Equation

[hafizur]

Eq(1)=> Daily average load =No. of units (kWh) generated in a day/24 hours

Eq(2)=> E=mC^2

where E=Energy
m=mass
C= velocity of light

How can I write this above two equations in this template and if length of a sentence is long then what to do?

[Johannes_B]

One proposal since i don't understand the question:

Code: Select all

\documentclass{article}
\usepackage{mathtools}
\usepackage{array}
\begin{document}
\begin{align}
	\mathrm{Daily~average~load~}&=\mathrm{No.~of~units~(kWh)~
	generated~in~a~day/24~hours}\\
E&=mC^2
\end{align}
where  \begin{tabular}[t]{>{$}l<{$}@{~=~}l}
E&Energy\\
m&mass\\
C& velocity of light
\end{tabular}
\end{document}

[Stefan Kottwitz]

Here is another example showing the use of siunitx. It may look strange here, but in bigger documents it's very useful for consistent scientific units and constants.

Code: Select all

\documentclass{article}
\usepackage{mathtools}
\usepackage{siunitx}
\DeclareSIUnit\E{E}
\DeclareSIUnit\c{c}
\begin{document}
\begin{equation}
  \text{Daily average load} =
    \text{No. of units (\si{\kWh}) generated in a day / 24 hours}
\end{equation}
\begin{equation}
  \si{\E} = \si{\m\c\squared}
\end{equation}
\end{document}

For the rest, see Johannes' post.

Stefan

[hafizur]

Thank you very much...

[Johannes_B]

Stefan,
i would argue that Energy, mass and speed of light have units to measure them, but are not units themselve. Einsteins formula looks really queer written as SI units.

Another thing i came around a while ago was that using \text isn't always a good idea. If that equation is used in a theorem with italic text, the text in the formula will also be written in italics, which would be inconsistent.

[Stefan Kottwitz]

By the way, you may notice that I wrote constants and units upright. That's what siunitx does, furthermore it takes care of spacing between numbers and units, and more.

Johannes is right, that E and m are variables, but c is a constant, to be written upright, and a mix would look even more strange... so I took the freedom to define them kind of symbolic upshape because we don't really calculate with those variables, or do we ...

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The photo is by Lienhard Schulz - Own work, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=795152.

Stefan

[hafizur]

Code: Select all

where  \begin{tabular}[t]{>{$}l<{$}@{~=~}l}
x&Measurement interval (1 hour). 
The value of x can be up to 8760 in a year, if the plant operates throughout. 
In case the plant has been shut down for some period 
in year y, in that year, use the number of measurement 
for x for the operational hour only\\
\end{tabular}

Here the description length of x is very long, this text cross the right side border in pdf and no starting in new line after first line. This sentence always in one line. How can I solve this?

[Johannes_B]

Substitute the final l (ell) when defining the columns with p{.8\linewidth}.

I recommend to read LaTeX for complete novices.

On the other hand, i think that in a sserious paper, the description of what a variable or constant is, belongs into the text. In text, the meaning can be written in clear sentences. A proper list of symbols at the begin or end of a paper with a short description for a quick look-up is the usal way to go.
Having the description glued to the equation is one of the most hideous things i see in academic papers and technical reports.

[hafizur]

Thank you.