{calculations} is about calculations in (La)TeX documents. A popular package is calc although may other also exist (fp, pgf, and LaTeX3 packages).

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6
votes
2answers
2k views

Coordinates A, B: compute |B-A| and angle between +x and (B-A)

This question has two parts: why is the angle computed always 0 (should be 45) what is a straightforward way to compute distance between coordinates (there is How can I compute the distance between ...
4
votes
1answer
457 views

Prevent tikz to calculate

I just played with an answer to a question I asked here some time ago: Divide a rectangle into n times k equal cells. I wanted to be able to generate the list of points in a separate macro, however ...
17
votes
6answers
2k views

Checking if a number is a multiple of 4

Using etoolbox, ifthen, or another form of conditional checking, how can I check if a value is a multiple of 4? E.g. if the number is 4, 8, 12, 16, etc., then it returns "true".
18
votes
2answers
4k views

How can I compute the distance between two coordinates in TikZ?

Given two points (defined, for instance using nodes), I want to compute the distance between them. Is there some build in functionality in tikz to do this? If not, how can it be done using the ...
12
votes
3answers
1k views

How can I calculate the difference of 2 counters (pageref)?

How can I calculate the difference between 2 counters (like page numbers), so that pdfLateX outputs "3" in the last line of my example? and how could I calculate the difference between the "current" ...
10
votes
2answers
742 views

Calculating percentage

I have tried to use the calc package to write a macro which prints a percentage based on two numbers. E.g.: \printpercent{100}{200} should display 50% as 100 is the half-way point of 200. I have tried ...
4
votes
1answer
290 views

Why don't modern TeX variants support floating point?

I understand that, at the time when TeX was devised, no single standard for floating-point calculations was available. But these days, there's IEEE 754. Why doesn't any TeX variant support it? ...
5
votes
2answers
821 views

Anomalies and a question regarding a line-filling rule

I've created a command for filling a line with a black rectangle. It's called \fullrule, you can find it in the code below. I have several questions regarding this MWE: \documentclass[10pt]{article} ...
9
votes
6answers
1k views

Parse simple arithmetics and return the result

I want a command \ca which takes a simple arithmetic calculation as an argument and returns the result with proper decimal places. Additionally I want an boolean argument which decides if only the ...
16
votes
3answers
830 views

Using command to compute sum?

I must admit this sounds like an easy question. I'm creating a grading model for a homework assignment, and I'm adding the maximum amount of points to each question. Is there a way to have LaTeX ...
34
votes
7answers
6k views

How do I calculate n modulo 3 in LaTeX?

I don't want to display the modulo symbol, I want to programmatically calculate n modulo 3 and display the result.
26
votes
2answers
36k views

How to fit a large figure to page [duplicate]

Possible Duplicate: Best figure size adjustment when dealing with different image sizes Given: a large figure, whose height:width ratio is unknown. Todo: Include this fig in LaTeX, such ...
9
votes
2answers
2k views

How to enable use of minus and plus in tex documents?

I see many cls files using plus and minus operators to set lengths. How can I use these operators (or some equivalent macro(s)) to do something like the following? \setlength{\lengtha}{.5\textwidth} ...
22
votes
2answers
6k views

Problems with TikZ calculations

When can I use functions and do calculations in TikZ? How do I make this work: \draw (0,0) arc(0:90:sqrt(15)); %not ok why is this working: \draw (0,0) arc(0:asin(1):5); %ok with ...
17
votes
2answers
5k views

Is plotting exponential graphs a known source of bugs in TikZ?

I want to plot $y = 2^x$ over a small domain. Unfortunately, even though tikz (v 2.1) seems to be able to calculate 2^{negative numbers} it is not plotting them correctly. My minimal example is: ...
5
votes
1answer
1k views

Insert relative date and time specifications?

How can I specify a relative date and let LaTeX insert the resulting absolute one? For example like this: \somedatecommand{next thursday} Which should result in: Thursday, 20.10.2011 Or: ...
8
votes
4answers
349 views

Calculating the the exact width of the text and a lettrine

This is one question which technically could be broken into two minor questions. I am using a lettrine and some verse text, but the calculation to determine how much to indent the text does not ...
32
votes
6answers
17k views

How can I sum two values and store the result in other variable?

In LaTeX2e,how can I sum two values and assign them to other variable? I want to compute something like: var=\textwidth - 1cm And if both were constants: var=1+1
7
votes
3answers
385 views

Convert hour to decimal number

I'm trying to make a command for converting an hour (ex: "14:17") to a decimal value (hour + min/60 = 14.28333333333) for use in a TikZ schedule : \creneau[day=1, start=13.5, ...
8
votes
2answers
2k views

How can I show base-2 long division?

I am writing a report in Latex and need to represent the CRC computation. So basically, I need to show the Paper-n-Pencil Method of Long Division in LaTeX. Any idea how I can approach this problem ? ...
0
votes
1answer
224 views

How should I express my length calculation to minimize rounding errors?

I have an input file as follows. % Test.tex \documentclass{article} \usepackage{pstricks} \psset { linewidth=0.01 } \newcommand\All{0.1} \newcommand\Left{-\All} \newcommand\Right{\All} ...
2
votes
4answers
723 views

Is there a simpler way to do arithmetic in PSTricks?

I want to animate PSTricks diagram, so looping is intensively used. I have 3 global variables \START, \STOP, \DELTA that should be declared in the preamble. The remaining variables in the body will ...
3
votes
4answers
282 views

What is the TeX equivalent for the following C# nested loop?

I need a nested loop to animate PSTricks diagrams. In C# or C or C++, I usually write as follows. int N=6; for(int x=0; x<N; x++) for(int y=x+1; y<N; y++) Console.WriteLine("({0}, ...
6
votes
1answer
607 views

How to divide a length-valued macro by a dimensionless-valued macro?

I have attempted to do as follows, but it does not work. \documentclass{minimal} \usepackage{pstricks-add} \psset { xunit=\dimexpr1cm/\psPi\relax, yunit=1cm } \begin{document} ...
1
vote
2answers
767 views

What is the correct syntax to do arithmetic for length and dimensionless macros?

I want to set papersize based on PSTricks settings. The PSTricks settings may be a value without dimension and/or a value with dimension. Honestly I have not read the TeXBook because of my laziness. ...
3
votes
1answer
274 views

How to translate this scenario to LaTeX looping macro?

I want to slice an image into 8 parts, i.e., 2 rows by 4 columns. Each part is on a single page as follows. The gray frame is the Acrobat Reader background, so don't think it is a part of the output I ...
2
votes
1answer
419 views

How to improve accuracy when working with PSTricks?

I have tried this with TikZ that produces the same issue, you can try Leo's solution here. In other words, this issue is NOT specific to PSTricks. The hidden idea is to avoid cropping with pdfcrop ...
15
votes
1answer
2k views

Determine height and depth of letters relative to the font size

I would like to scale graphical elements (like images, tikz and tikz-timing diagrams) relative to the font size, so that they have the same height as an normal uppercase letter (i.e. X or M; I noticed ...
6
votes
3answers
1k views

Having trouble dividing lengths with calc package

What I want is something like \resizebox but which I can give a maximum height and width to, it will make it fit into those bounds, and not distort the image. (\resizebox, of course, always makes it ...
3
votes
1answer
293 views

How does spreadtab know it is a number?

Using spreadtab with glossaries I define a glossary entry A with a field user1=12. Now, if I call this field in a spreadtab table with \glsentryuseri{A}, spreadtab does not recognize it as a number. ...
58
votes
3answers
15k views

Get width of a given text as length

Is there a TeX command that returns the width of a given text as length value, so that I can use the result directly as a length argument of another command? I mean, I would like to have a command ...
10
votes
2answers
5k views

simple arithmetic on index of foreach statement in tikz

Is foreach really a tikz statement or is derived from some other package? I would like to draw a horizontal axis with 7 ticks spaced 1 cm apart. I'd like to place a label under each tick that is the ...
2
votes
1answer
5k views

TikZ Coordinate calculation - calculate coordinates separately

I'm trying to calculate coordinates based on existing coordinates but each coordinate individually. The first thing which is unclear to me is how to define scalar variables. I can define coordinates ...
12
votes
2answers
1k views

Where is the left-hand margin?

I'm working on the TikZ-from-TeX-SX package, specifically developing the code for putting equation numbering at places within a tikzpicture environment. To do this, I need to know where the text ...
6
votes
2answers
845 views

“Pretty-printing” numbers with significant figures

I like to use LaTeX to display data in figures and tables. I've used arrayjobx.sty and fp.sty to extremely good effect to handle data that comes out of, e.g., Excel or other Windoze-world data ...
2
votes
1answer
1k views

Calculating position in tikz

I'm trying to do calculation to be used in tikz. Here is my current code: \def\monthtabpos#1% {\ifthenelse{#1<7} {\dimexpr \numexpr -3*#1 \relax cm} {\dimexpr \numexpr -3*(#1-6) \relax ...
22
votes
5answers
4k views

Floating point calculations in LaTeX?

I am looking for a method to do minimal floating point / integer calculations in LaTeX, not for the purpose of package writing, but for the production of actual text. Here is an example to ...
9
votes
1answer
1k views

Shrinking text to the width of a node within a tikzpicture

I would like to be able to scale text to the width of a TikZ node. Using \widthof within tikzpicture as a starting point, I've arrived at somewhat of a solution, except it has incorrect spacing, and ...
16
votes
7answers
1k views

Calculating right angle triangle side inside LaTeX

I'd like compute the width of a screen from it's diagonal and its aspect ratio inside a LaTeX document. The formula is easy to get from the Pythagorean theorem, but needs square roots. I currently ...
5
votes
2answers
1k views

How can I nest coordinate calculations in TikZ?

Why does this not work? I'm not using LaTeX and TikZ very much; I don't see it. \begin{tikzpicture} \coordinate (Zero) at (0,0); \coordinate[label=below:cell a] (vertexA) at (0, 10); ...
12
votes
1answer
917 views

Difference between two dates

Is there a macro that calculates the year and months from a given start date and the current date. So let's say I have 05/02/2010 (the start date), then it should do the following: Today - ...
17
votes
2answers
698 views

Handling different time zones

I'm looking for a way to handle date/times with different time zones. For example in svn-multi and filemod a date and time with a timezone is returned. I like to be able to compare times in different ...
5
votes
2answers
667 views

Adding numerical values in a LaTeX tabular column [duplicate]

Possible Duplicate: How can I automatically calculate sums in a LaTeX table? Does anyone know if the is a TeX/LaTeX package which will make an ordinary tabular environment work as a simple ...
5
votes
2answers
1k views

Calculate maximum of lengths

How can I calculate a maximum of lengths? I am aware of pgfmath's function max(x_1,x_2,...) \documentclass[a4paper,draft]{article} \usepackage{tikz} \pgfmathparse{max(3,4)} \begin{document} ...
4
votes
1answer
2k views

Measuring height of fixed-width text box

Suppose some text is put inside a fixed width box. The text will then continue in vertical direction. How can you measure the total height of that text? Original text: text text text text text ...
15
votes
3answers
2k views

Why doesn't \settoheight of \parbox work?

Consider the following code: \documentclass[a4paper]{letter} \usepackage{calc} \usepackage{printlen} \newsavebox{\foobox} \newlength{\fooboxheight} \savebox{\foobox}{ ...
18
votes
2answers
944 views

Automated age calculation

How can I calculate my age at compile-time in LaTeX? Something like: I'm \myage{day}{month}{year} years old. would be most awesome.
17
votes
3answers
2k views

Doing maths with distance values in LaTeX source code

I have a sty file with the command \newcommand{\foo}[1]{\noindent\kern#1} but I'd actually like to have something like \newcommand{\foo}[1]{\noindent\kern{#1 *0.5}} meaning that I'd like to have ...
4
votes
3answers
2k views

Can LaTeX perform simple math operations? [duplicate]

Possible Duplicate: How can I automatically calculate sums in a LaTeX table? Can LaTeX do simple math? I have a table with two columns and want to automatically add a third column which ...
6
votes
2answers
1k views

\widthof within tikzpicture

In this minimal example \documentclass{scrartcl} \usepackage{calc} \usepackage{tikz} \newlength{\TestLength} \begin{document} \setlength{\TestLength}{\widthof{\tikz \node {bla};}} ...