# Tagged Questions

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

3answers
67 views

### How can one number be divided by another number to give a real number result (not an integer)? [duplicate]

How could a function a bit like basiceval be written to give a real number result as opposed to an integer, making the third calculation here more accurate? \documentclass[american, a4paper]{report} ...
2answers
120 views

### Numerical calculations inside table environment

I am doing a coursework in mechanics and would like to write both the theory and calculations in LaTeX. However, as design is iterative process, I would like to escape the tedious cycle of: Select ...
2answers
191 views

### Tikz: Math with coordinates

I need to extract the coordinates of a node into a variable. I've tried \pgfextractx \documentclass[11pt]{article} \usepackage{fp} \usepackage{tikz} \usetikzlibrary{calc} \begin{...
1answer
89 views

### calc breaks assoccnt? [closed]

I want to use totcount to get the number of parts and chapters in my document. To get the correct number of chapters in the presence of appendices, I use assoccnt (see totcount gives wrong chapter ...
2answers
86 views

### Show variable name, measurement unit and value in a single command invocation

I am using the fp package to write a coursework in mechanics and calculate the numerical values on the fly. Here is some example code: \documentclass{article} \usepackage[nomessages]{fp} % http://...
1answer
72 views

### Calculation in a TeX function. How to do it?

I don't know anything of TeX but would like to improve a function. Here is the initial function: \newcommand{\setnewvsize}[1]{% \global\paperheight\dimexpr#1+\initialVerticalInset\relax% \global\...
1answer
112 views

### Determine width of a milticolumn cell

I am attempting to draw a rectangle within a multicolumn, and would like it to span the width of the cell and be consistant with a similar rectangle drawn in a standard cell. I am struggling to ...
4answers
422 views

### Error using \widthof inside tikzpicture

\documentclass{article} \usepackage{tikz} \usepackage{calc} \begin{document} \begin{tikzpicture} \newlength{\TextWidth} \setlength{\TextWidth}{\widthof{Text}} %\node[draw,text width=\...
2answers
289 views

### Enumerate every third item

Is there a way to have a enumerate environment that increment the counter every three item? I already see this question: Enumerate pattern: 1, 1, 2, 2, 3, 3, ... , etc but I'm looking for something ...
0answers
177 views

### Insert negative of \widthof into \hspace without defining a newlength

Following MWE does not work: \documentclass{article} \usepackage{calc} \newlength{\charwidth} \setlength{\charwidth}{\widthof{$-$}} \begin{document} \centering $\infty$ \centering \hspace{-\...
1answer
67 views

### Calculator package and Math Times Pro 2

When I try to use the calculator the mtpro2 package at the same time I get an error message. Recently I found out that this issue has something to do with the \SQRT command. \documentclass[a4paper,...
3answers
540 views

### Drawing the three altitudes of a triangle with TikZ; incorrect orthocenter

You probably know that if you draw all three altitudes of a triangle, they will meet at a single point, the orthocenter. I'm trying to draw a picture that shows the intersecting altitudes with TikZ ...
1answer
96 views

### Using a variable to calculate the tax on an invoice

I've customized a class to obtain the tax value and also the total amount in an invoice. This is the portion I need to modify: { \hline\hline\hline {Valor venta} & & & {S/. \total{cost}} \...
1answer
83 views

### Length operation within a newtcblisting

Consider the following code: \documentclass[10pt,letterpaper]{article} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage[french]{babel} \usepackage{calc} \usepackage{tikz} \usepackage{...
5answers
1k views

### Reducing fractions automatically using LaTeX 3

Consider the following code: \documentclass{article} \begin{document} \noindent Can I make \LaTeX{} reduce a fraction automatically?\\[\baselineskip] For example, I would like the fraction \[ \frac{...
4answers
765 views

### Using LaTeX as calculator [duplicate]

I know that exist several packages, like fp that allow to make all kinds of computations. But I do not understand the correct way to use them. I need some simple examples of multiplication and ...
1answer
24 views

### Unable to make crop work with dynamic length and width from calc

I am using using XeTeX, Version 3.1415926-2.4-0.9998 (TeX Live 2012/W32TeX) to design a book cover. I thought of writing a generic document with customizable sizes of book width, height, bleed and ...
1answer
22 views

### Package that receives a number #1 and return #1-1

I'm working with a counter but I'm having some problems with the index. This is my problem: I'm using a command with \arabic{#1} with some input #1. But I need to print \arabic{#1-1}. I would like ...
1answer
50 views

### Computation of size in titlespacing

Consider the following example: \documentclass[11pt,a4paper]{book} \usepackage{lipsum} \usepackage{titlesec} \newlength{\textsize} \makeatletter \setlength{\textsize}{\f@size pt} \makeatother \...
2answers
686 views

### Length plus minus other length?

Consider the following example: \newlength{\textsize} \makeatletter \setlength{\textsize}{\f@size pt} \makeatother \setlength{\parskip}{12pt plus 1pt} % WORKS \setlength{\parskip}{\textsize plus 1pt}...
1answer
75 views

### Inline calculation gives Could not parse input error in PGFplots

The inline calculation exp(\tick) in PGFplots gives me a Could not parse input error when compiling the code \documentclass[margin=1cm]{standalone} \usepackage{pgfplots} \begin{document} \begin{...
1answer
395 views

### Tikz coordinate calculations inside foreach

As part of a drawing that will go with an explanation of diffraction, I want to draw the "outer rays" of a beam of light and draw several rays in between. An MWE of how I'm going about this is shown ...
0answers
24 views

### Convert decimal to integer in Visual TeX IDE [duplicate]

I want to convert decimal number to integer in latex program with Visual Tex IDE. I found this function \pgfmathparse{ceil(2.7)} which requires installing the package pgfmath and pgfkeys. And after ...
3answers
63 views

### Using reference labels in mathematical calculations

EDIT: This answer points to a good solution. I wanted to use reference labels in mathematical calculations and was under the impression that if I use the calc package, it will be rather ...
1answer
93 views

### Make \droptotalpoints look like \droppoints (exam documentclass)

To save typing, I have \newcommand{\q}{\question[1]} defined in my exam documentclass. Then, after the question, I use \droppoints to get [1 pt] printed in the right margin. But sometimes, my ...
1answer
326 views

### Simple arithmetic in an exam

How can I do some simple calculations in LaTeX? Specifically, I want to divide \numpoints (part of the exam package) by 1.10. That is, I want to do something like this: Grade: \underline{\hspace{2cm}...
2answers
495 views

### Missing number, treated as zero with amsmath and calc

This simple code produces "Missing number, treated as zero" \documentclass{article} \newcounter{test} \newcounter{testtwo} \usepackage{calc} \usepackage{amsmath} \begin{document} \addtocounter{...
1answer
75 views

### Why is \glueexpr used in etoolbox's \deflength instead of \dimexpr

Consider the following snippet from etoolbox: \newrobustcmd*{\deflength}[2]{% \ifundef{#1} {\etb@noglobal\etb@err@nolen{#1}}% {#1\glueexpr#2\relax}} Maybe I do not understand the ...
3answers
283 views

### Multirow and rotated column headers

I want to typeset a table with rotatetd column headers (so far it works) stretching over multiple rows. The problem seems to be that multirow does not adjust the tables row heights, thus I have to do ...
1answer
52 views

### TikZ: Move points towards center

I want to move a set of points towards the center of my figure, but I want the distance to depend inversely on the relative distance to the center. Thus, for instance move a point at (-2,-3) to ( -2 - ...
3answers
199 views

### Comparing calculated real numbers

"\ifdimless" can compare two real numbers. But, how can we feed the result of a calculation to this function ? \documentclass[]{article} \usepackage{tikz} \usetikzlibrary{calc} \usepackage{etoolbox} ...
1answer
108 views

### Modifying the equation number with simple calculation

I am trying to modify the equation numbering as follows \renewcommand{\theequation}{FFF(\arabic{SomeCounter}).\arabic{equation}}, where SomeCounter is a counter defined as \newcounter{SomeCounter} ...
0answers
75 views

### guess a number proportional to another [closed]

This is a challenging question. I am not sure how to begin coding it, or whether it is easily possible in TeX. I wish to define a command that takes in input of a simple formula such as Z = X x N + N^...
4answers
481 views

### Chain addition mod 10

Is it possible in LaTeX create a table-like structure that represents successive modulo-10 addition of the individual units modulo 10 with wrap-around? This is referred to as chain-addition. For ...
1answer
260 views

### Calculations in PGFplots \addplot3 inline table

Plotting a rectangular patch with the code \documentclass{standalone} \usepackage{pgfplots} \begin{document} \begin{tikzpicture} \begin{axis} \addplot3[patch,patch type=...
1answer
117 views

### Calculate quartiles of data set

Comment: The following code is taken from egreg's answer here. Code: \documentclass{beamer} \usepackage{lmodern} \usepackage{booktabs} \usepackage{siunitx} \usepackage{xparse} \ExplSyntaxOn \...
1answer
314 views

### Calculating a point in TikZ that completes a right trangle?

I am trying to draw an incline plane free body diagram for my Physics class ( a little like the one pictured here): Currently, my code looks like this (using TikZ, tkz-euclide, TiKz libraries calc ...
1answer
214 views

### Calculate axis limits depending on depicted data

In a pgfplots axis environment, I want to make the axis limits dependent on the depicted data or some other data. Consider the minimum working example \documentclass{standalone} \usepackage{pgfplots}...
3answers
739 views

### How to calculate a percentage and use result in progressbar?

With the progressbar package, I want to show bars on pages depending on a counter. Progressbar works like: \progressbar{0.7} I use the calc package anyway, so I thought it should be easy to ...
1answer
273 views

### Tikz 3d trimetric view coordinate calculation bug

I'm trying to draw a line in the x-y-plane and circles in the y-z-plane at constant x position. Problem is, that the circle is far out of position (x-coordinate of center point of the circle is ...
1answer
94 views

### Parse numerical value from glossaries variable

Can I parse the text returned from \gls*{...} and get latex to recognize it as a numerical variable so that I can use it in a calculation? This calculation could be done using calculator, fp, calc or ...
1answer
84 views

### How to print a past value of a counter [duplicate]

I have this counter which I have defined using \newcounter{myCounter}. Printing the value of myCounter can be easily done via \arabic{myCounter}. How can I print the value of (myCounter - 2)?
1answer
146 views

### Does anyone have an explanation of the algorithm for calculating weeknumber by Taco Hoekwater?

Taco Hoekwater wrote an algorithm in 2006 calculating the weeknumber. The algorithm mostly computes the weeknumber correctly, but apparantly misses out for the first 4 days of 2015. Without an ...
1answer
507 views

### Is it possible to use the width of one TikZ node to calculate the width of another?

Question Is it possible to store the variable width of a node and use that width to calculate the text width of another node in TikZ? Example I have a list of similar nodes side-by-side (inline, ...
3answers
695 views

### What is the best way to do math inside LaTeX macros?

I'm interested in writing a little personal package (or sharing it if it's actually useful) to speed up typesetting Trigonometry. I'd like commands like \triangle{\alpha}{\beta}{\theta}{a}{b}{c}{30}{...
1answer
92 views

### How can I calculate the distance added between a title and a titlerule?

Question How can I calculate the distance after a title such that I can place a node where the title rule would go? Example I would like a bar to drop from the top righthand corner of the page down ...
3answers
750 views

### How to round number to two digits after the decimal place and have a comma separator?

I have the following function: % Formats inputed number with 2 digits after the decimal place \newcommand*{\formatNumber}[1]{\FPround{\cost}{#1}{2}\cost} % \cost goes through some calculations ...
1answer
830 views

### How to solve the Arithmetic overflow problem?

I was making an article and everything was going alright, when suddenly I got an error: The error: Arithmetic overflow. \calc@Acount l.78 ...qwe dqweqwrwf qewrfrQ aRF EFCas drfFR}{62} My article ...
1answer
273 views

### How to divide two lengths and get a result as an integer?

I have a problem dividing two lenghts and getting a result as an integer. I was trying to use this package: \usepackage[nomessages]{fp} It didn't really work for me. I tried it multiple ways, but it ...
2answers
665 views

### Sum of finite series using LaTeX 3

Is it possible to calculate the value of a finite series, say, using LaTeX 3?