# Tagged Questions

Questions about using, converting, or interpreting units of measurement in Mathematica.

48 views

### How to correctly use FormulaData

I am exploring some of the functions involving units and formulas, and wondered how to input quantities if the variable has a subscript. This works ...
133 views

### Differential Equations and Unit Notation

What do I get the Syntax::sntxi: Incomplete expression; more input is needed . error when I try to use the math palette for derivatives? What does the dot in ...
59 views

### Simplify CubeRoot of meter cubes

Why Mathematica doesn't simplify CubeRoot of meter cubes to meters? r = Quantity[10, "Meters"]; v = 4/3 r^3 Pi; CubeRoot[% * 3/4 / Pi] returns ...
53 views

### UnitConvert bar <-> Pa

I wanted to use the following unit cMax = Quantity[6.8221*^-9, "L/s/bar"]; But when calculating with it, I recognised there is some strange behaviour. So I tried ...
234 views

### Solving equations with QuantityVariable

I'm trying to understand how to easily solve equations that use QuantityVariable. Why does this fail? ...
731 views

### Unit of the frequency axis in BodePlot

I have a simple question: What is the unit of the frequency axis in the BodePlot? I searched the documentation, but only found this: The scaling functions can be specified as ScalingFunctions->{{...
46 views

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99 views

### Converting Units in formula

I have the following formula ...
109 views

### Changed appearance of Quantity expressions in v10.1.0

After installing Mathematica v10.1.0 (in Windows 8.1 x64), I noticed a change in appearance of Quantity expressions. For example under Mathematica v10.1.0: while ...
158 views

### NIntegrate with units: unable to determine the units of quanitites that appear in the input

I want to integrate Planck's law of radiation in a certain wavelength intervall with units. I define some constants: ...
129 views

### Plotting Earth's position with units

I'm trying to plot the Earth position with the Sun in the origin. I have two lists like this: ...
108 views

### Extract function parameters from “unevaluated” FormBox

I want to get the abbreviation for a Unit from its full name eg. "Newtons" => "N". Using <...
104 views

### Unit System documentation

Is there any documentation on what consists of the unit system "SIBase","Imperial", "SI" and ...
101 views

### Grouping units more sanely

Would it be possible to get Mathematica to group units more sanely. For example the calculation: ...
72 views

### Convert large KML coordinate datasets to UTM [closed]

I was wondering if there are ways to convert massive amounts of KML coordinates into UTM coordinates using Mathematica. Other programs would also be acceptable. Thanks. I have the KML file from ...
29 views

### Using Infinity with AutomaticUnits

I am using the AutomaticUnits package in Mathematica 10, and I am writing some unit checking functions. However, I run into a problem when I have an Infinity, since ...
56 views

### Using Quantity[] units causes errors in my calculation

I have an interpolation function in which I wish to use actual units. If I perform the calculation normally, it works fine and returns a proper FittedModel. To illustrate my problem, consider the ...
88 views

### Geodesy without units?

Suppose I'm interested in the latitude of Los Angeles and I do the following: ...
125 views

### How can I say that all quantities need to be positive (and real)? [duplicate]

Can you say at the beginning of a script in Mathematica that you want all the quantities to be positive (and real)? So that in all calculations, only the real values of these quantities will be ...
167 views

### Converting the units of an equation or expression (how to become 3 times heavier…)

(THIS QUESTION HAD A MAJOR SIMPLIFICATION EDIT) Lets suppose I want to convert the falling body equation, from one set of units to another. I start with: ...
112 views

### AstronomicalData not including units?

I like using mathematica to do my physics homework, and AstronomicalData is useful for that, but it doesn't seem to work properly with units. [the question is, at ...
68 views

### Electromagnetism units conversion in Mathematica 10 (possible bug)

Is this a bug in Mathematica 10? Why can't I convert Amps/m to Gauss? ...
51 views

### Enter meter unit with Histogram [closed]

I'm looking at the documentation for Histogram and I am trying the example: ...
85 views

### Working with symbolic values in Quantities [duplicate]

I have the following expression: x Quantity[y, ("Milliwatts"*"Seconds"^2)/"Joules"] If I try to convert this to the SI unit, I would expect to get ...
386 views

### Unit conversion is not simplifying units

I'm running into what looks like an error. ...
33 views

### How to set UnitSystem permanently

I would like to set the system of units (\$UnitSystem) permanently to "Metric". I know that I can do ...
22 views

### Set default unit for information rate and others

I am using mathematica to convert units to canonical form, like I have 0.2 KBYTE/s and I want to get 200. So I want to see all '...
23 views

### Evaluating UnitConvert inside LogPlot

I imported several Physical Quantities with their units and doing single calculations with them works fine and return the right unit, which I can change by UnitConvert[]... For the LogPlot I made a ...
31 views

### A complete list of quantities in Mathematica 9/10? [duplicate]

Often times when I'm traveling I don't have internet access and cannot reliably use Wolfram Alpha for unit look-up. Additionally, Alpha can always choose to change how it interprets the units I enter, ...