Questions tagged [arithmetic]

Questions on arithmetic operations in Mathematica.

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219 views

Lines of intersections in a parabola

To test the parabolic sieve, my intention was for the graph to show the coordinates of two points on the parabola and the value of the intersection on the y-axis. A table with this information would ...
676 views

there is a question： " If a bottle of soda costs \$1 and you can exchange two empty bottles for one soda, how many sodas can you drink with \$20 " ...
122 views

How can I enforce the use of Subtract and Divide?

It has been noted before, here and here, that when you enter a/b or a-b, Mathematica does not convert these to ...
496 views

How to check if multiplication requires carries?

For some purposes I need to know if there are there any carries in the multiplication of two numbers, especially in base-2. How can we do this in Mathematica? Thanks to all, very interesting answers! ...
547 views

How to find a longest word path in dictionary?

Cross post here A word path means the last character of the last word is same to the first character of the next word.And the path have no duplicated word.If I have $55$ words,I can find it with this ...
143 views

Simplify expressions with modulo 2 (Boolean algebra)

Suppose I have a (Boolean algebra) expression a = p1 x^2 + p2 x (x-1) + 3 p3 + 4 p4 x where p1, ..., ...
1k views

How to enter a repeating decimal in Mathematica

I don't understand how to manipulate numbers with repeating decimal in Wolfram Mathematica language. For example 0.3... does not work as input and I don't see how ...
306 views

Arithmetic operations on NumericArrays

Currently, NumericArrays are directly supported by the most important array-related functions, what makes them a very attractive data structure for implementing ...
63 views

How can I redefine multiplication this way?

I want the product of matrix objects to be evaluated to the matrix object of dot products of the arguments, but only if the matrices commute. Why this does not work? ...
3k views

Permanently rounding numbers/values to a given number of significant figures

I am searching for a simple way of rounding and setting an input to a desired number of significant figures. There are a vast number of posts that discuss similar problems, but none address this issue....
213 views

How can I redefine multiplication?

For instance, I want 0 Infinity = 0 I tried this: Unprotect[Times];Times[Infinity,0]=0;Times[0,Infinity]=0;Protect[Times]; But ...
1 vote
181 views

Express rational and infinite expressions in Mathematica [closed]

I have several doubts about notation. I would appreciate any clarifications. a) I can express, for example, a periodic or semi-periodic number without writing it in its rational form. Can such ...
73 views

Problem with Mathematica Relationship Building

When I enter the following to get Mathematica to open my pod door I get Could someone try and replicate this? Also, my name is not Dave and I throw my own error... ...
111 views

long division acurate answer on dividing long numbers [closed]

ok but first of all if i have the huge number to be divided what will i have to use for the division to be accurate long division or some other formula square root or 2 this is to calculate music ...
1 vote
378 views

The square of Abs of a complex number

We all know that 4^2 + 22^2 = 500 Is there a natural way to generates 500 from the complex number ...
60 views

Ordinal arithmetic

How can I compute with ordinals in mathematica? For instance, I'd like to query $2+\omega > 1 + 2 \omega$.
723 views

Rounding Real number

I have real numbers in array, I want to round (or truncate) these numbers to 2-digit after decimal point, then I want to write values to Excel File For example if I have ...
249 views

Does Mathematica simplify calculation when encounter zero?

e.g. when Mathematica Calculating f[x0]=A[x0] B[x0], where A[x] & B[x] could be some complicated high dimensional function. Will Mathematica outcome 0 directly ...
1 vote
25 views

Mathematica 12.1: Evaluation result does not show decimals [duplicate]

It surprises me that Mathematica does not show decimals after evaluating the following calculations: 500000+5.05 Result: 500005. Expecting: 500005.05 ...
164 views

How does Leafcount work? [closed]

I am curious about how LeafCount works because when I count the number of leaves in my solution to a Wolfram Challenge, I get a much smaller result than those listed on the leaderboard for Multiples ...
248 views

How to calculate percentage change using Dataset[]

With the following code, I can calculate percentage changes in selected indicators over time. The code is not efficient nor practical to integrate it into Manipulate...
3k views

Insert $+$, $-$, $\times$, $/$, $($, $)$ into $123456789$ to make it equal to $100$

Insert $+$, $-$, $\times$, $/$, $($, $)$ into $123456789$ to make it equal to $100$. Looks like a question for pupils, right? In fact, if the available math symbols are limited to addition ($+$), ...
716 views

How to multiply a vector by a scalar?

I'm plotting a simple 2D graph derived from 4 3D vectors: ...
1k views

Is there a difference between Divide[a,b] and a/b?

In this comment it was asserted that Divide[a,b] and a/b are different, though the documentation indicates that they are the ...
331 views

How to generate multiplication tables up to nxn?

I'm doing a simple multiplication table and I have this that I'm having a hard time with. I imagine that there must be a shorter way to do it, what I can't get is that it paints black the first column ...
177 views

Running Mathematica in 'SpouseMode'

In this previous question I looked into a deprecated capability of Mathematica from Version 2. Mathematica command that allows it to read my intentions Thanks to all for your answers. I note that ...
86 views

Can we change Mathematica's original number system for arithmetic mod p or other arithmetic systems?

It seems Mathematica has a standard arithmetic system that resembles real numbers. Can we change Mathematica's original number system for arithmetic mod p so that whenever we write expressions, it sum ...
166 views

Solving calculation puzzle [closed]

I recently got asked how to achieve a result of 100 only using the numbers {1,7,7,7,7} (the number 1 can be used only once and ...
1k views

How to prevent reduction of a fraction into lowest terms?

I have a question about the concept of simplification. I want to explain it with an example. When I write the fraction $4/8$ in Mathematica, the output is 1/2. How ...
1 vote
74 views

Explanation on why this gives overflow?

If you have a phrase like $10^{0.00057 \cdot 10^{42}}$ that gives "overflow", what is the reason? Is it because, well, something about the size of this whole thing?
67 views

Should I redefine 0^0 [duplicate]

I've found some times, while playing with combinatorics, that Mathematica can't calculate some functions because $0^0$ is not defined as $1$. (I know that some people think that $0^0$ should be left ...
122 views

Can I make RandomInstance use exact arithmetic?

When using RandomInstance on a GeometricScene the answer loses precision when root objects are encountered. Is there a way to ...
64 views

LocalTime arithmetic

In an attempt to calculate the time difference between two cities I enter: ...
90 views

Why does Log[Abs[#]] return a complex number?

For a nonzero number $x$, $\log|x|$ should be a real number. Why does the following NestList contain non-real numbers when no numbers involved are close to zero? Is it a bug? ...