Difference between revisions of "LaTeX/C2/Equations/English"

1. Both equations.tex and numbers.tex should be sized
2. Both should be opened in Texworks
3. Both should be at the first line
4. equations.tex should be at the top, and numbers.tex should be below
5. Compile numbers.tex and get numbers.pdf
6. numbers.pdf should be sized
7. numbers.pdf should be scrolled all the way to the top
8. eqn-slides.pdf should be at the first slide
9. All should be arranged, as recorded in the tutorial
10. equations.tex should be directly below the slides file

My name is Kannan Moudgalya

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How to write multiple equations

How to align multiple equations and

Why we should avoid the dollar mode and blank lines while writing equations

One needs LaTeX

I shall use Texworks, although it is not required

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One needs to be familiar with spoken tutorials that introduce LaTeX

Exposure to the recommended method of side-by-side learning

This information is available at the Spoken Tutorial webpage

Open in Texworks

Back to slides file, press down arrow

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I have opened it in Texworks

It is available as a code file along with this tutorial

You need to have it to practise along with me

If you don't have it, please download it from the Spoken Tutorial website

Web browser is opened

I learnt my LaTeX from this book

It is available for about Rs. 500

Let me show on the web browser where one can buy it

Open numbers.tex

I have already opened the file equations.tex in TeXworks.

I have saved it as numbers.tex to use in this tutorial

I will keep the file equations.tex intact, and not change it

Let me open numbers.tex

Please pause the tutorial, make this copy and open it

Whenever you want to start afresh, you can make a new copy of equations.tex

I recommend this method whenever a code file is given with ANY spoken tutorial

You can see the pdf file on the right

Let us look at the tex file, which begins with its usual commands

I have chosen the width of the pdf file to be 8cm

This is the only way I can show the entire file and also use a large font

Change 7 to 15

Put back 7

Click amsmath line

But I will continue to use 8cm

I am using the package amsmath

lick u(t) line in tex

click u(t) on slide

Hover on \left and click \right

You can see how it gets typeset in the pdf file

On the left hand side of this equation, we have u(t)

On the right hand side, I have produced big square brackets

How did I do this?

With “back slash left square” and “back slash right square” brackets as shown here

Click align* line

Click the x_1 line

Click on the eqn

Click on matrix pdf

Click on matrix tex

Delete row 1 compile

Click the pdf

Undo the last command in tex

On the left hand side, we have the derivative of a vector

We can see the pdf output here

On the right hand side, we have a 3 by 3 matrix

See the corresponding output

Suppose we delete the first row in this matrix and compile

We get a 2 by 3 matrix pdf output

The first line is gone

It is your responsibility to make the equations correct and consistent

Let me put the row back

Let me compile

You can also add more rows, if necessary

Similarly, you can change the columns too

Put $ and compile

Here, align plays the role of the $ mode

In fact, one should not put the dollar sign within the align environment

Suppose we put the alpha symbol within $ signs and compile

We get an error message about $

Press the cross symbol on the top left red box

And abort the previous compilation

Let us remove the $ signs

Compile again, it works

Below the line with alpha, leave a blank line

Put %

Let me leave an empty line and compile

It gives an error message

If you need this gap, put %, the comment character, in the first column

Abort compilation

Compile again - we see that it works

Let us remove this line and compile

Remove \end{align*}

Remove \begin{align*}

Put the text into \intertext{}

Compile

Put & sign before =

Repeat in the 2^nd eqn.

Compile

For this, we need to put both equations inside one align star environment

Remove the end align* command of the first equation

Remove the begin align* command of the second equation

Let us compile

We see only one equation appearing

The text in between the two equations appears as a large string

The second equation does not even show up

This is not what we wanted

This problem is solved with the help of the intertext command

Let us put the text in between braces

Let us also put this command back slash intertext as I type now

Note that intertext is one word, without a space in between

Do not forget the back slash before intertext

Also, do not forget the closing brace

These are all common mistakes

On compiling, we get this pdf file

You see the equations right aligned

I am not happy with it

I want to align by the equal to sign

Let us put the ampersand sign in front of the equal to sign of the first equation

Let us do it on the second equation also

If you have more equations to be aligned, do this for all of them

On compiling, we see the two equations aligned by the equal to sign

Remember to use the intertext command whether you want the equations aligned or not

Delete text lines

Put \\

Compile

Undo

To understand this, let us delete the entire text between the two equations

Note that we should not leave an empty line

On compiling, we see both equations coming in the same line

We didn’t tell LaTeX to start the second equation in the next line

We solve this by putting two back slashes

Let us compile, to get the correct pdf file

Let us now undo and put the text in between two equations

Let us compile once more

Let me go to the slides

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Please recall each of these commands

This is your first assignment

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Can you pause the video and try to produce these equations?

The required code is given here

Notice that these equations are now aligned at the equal to sign

Please pause the video and try this input

You should get this output

Forgetting ampersand signs is a common mistake made by everyone!

Use the hint given here

Please pause the video here, and try to produce them by yourself

I have given the answer here

Insert some text between equations

This video summarises the Spoken Tutorial project

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• Choose the minute and second where you have the question
• Explain your question briefly
• Someone from our team will answer them

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