# Tagged Questions

Wolfram|Alpha is a "computational knowledge engine" developed by Wolfram Research, announced in March of 2009. It is unique in that in answers queries with direct computational results, rather than bringing up a page of documents and various webpages as most search engines do.

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### How accurate is Wolfram Alpha?

I recently started learning about floating point arithmetic and a how computers have limited precision when dealing with such calculations. To what degree of accuracy can Wolfram alpha output ...
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### How to substitute values to equation in Wolfram Alpha?

It's a fundamental use and WolframAlpha appeared entirely uncooperative. Given: E = (4.49*10^16 Joules), m = (1 kilogram), c = (speed of light in vacuum), and the equation: v = (sqrt(E) c sqrt(2 ...
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### Using variables with name longer than one letter in Wolfram Alpha

I am new to Wolfram Alpha. Doing my best, still I don't know how to use a variable with a length higher than one. Here I use a variable called ba while wolfram alpha interprets that as b*a instead of ...
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### How do I get the upper or lower value of a time/date range, using Wolfram Alpha?

If I have a query, that returns a date or time range, how do get the upper or lower bound? For example, Ramadan 1436 returns: Thursday, June 18, 2015 to Friday, July 17, 2015 Another example is ...
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### Simplifying (-1)^n + 1 for integer n in Wolfram Alpha

How do I make Wolfram Alpha transform (-1)^n + 1, where n is an integer, into 0 for n = 2*k + 1 and 2 for n = 2*k? Is there something like that?
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### Is there any way to get unlimited computation time on WolframAlpha?

WolframAlpha imposes a limit on the amount of computational time it allows for each computation. If you have WolframAlpha Pro, you can do computations with a higher limit on computational time. But ...
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### Is WolframAlpha doing Math wrong?

I just tried to solve the following equation with WolframAlpha and got some very weird results: \sum_{i=1}^{x}x^2*i = 318338237039211050000 WolframAlpha tells me, one of the real solutions is x ...
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### How do I input a vector in Wolfram Alpha?

How can I write this expression into Wolfram Alpha? I have read the vector examples page on Wolfram Alpha's homepage, but I didn't know which method to use.
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### 3D graphic / plot / visualization

Could someone tell me how to get WolframAlpha to graph/plot/show graphic of this: 16<=x^2+y^2+z^2<=25 ; x,=0 This did not work: 3dplot[x^2+y^2+z^2]
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### WolframAlpha won't recognize my second derivative

I have been trying to calculate my derivative in WolframAlpha by inputing this: A=0.921/10^(9), a=1*10^(-9), h=1.055*10^(-34), m=9.109*10^(-31) int_((-pi)/(2*a))^((pi)/(2*a)) A cos^2(x/a)*(-h^2/...
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### RSA algorithm: How to enter the multiplicative inverse to WolframAlpha?

I'm trying to enter step 5: Compute d, the modular multiplicative inverse of e (mod φ(n)). How do I enter this in WolframAlpha? http://en.wikipedia.org/wiki/RSA_%28algorithm%29#A_working_example
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### Plot multiple functions in Wolfram Alpha

I tried to multiple plot in WolframAlpha using this command from the Forum: plot {1<=x<=2 1<y<3} and plot {x=4 1<y<3} and plot {1<=x<=2 y=4} and plot {x=4 y=4} and plot {1<=...
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### Wolfram|alpha comparing country sizes

By inputting Portugal shape area, China shape area to Wolfram|alpha I can get two country shapes, but how can I get them on top of each other at the same scale? The output I'm looking for is ...
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### How do I plot multiple probability distributions in Wolfram Alpha?

I am trying to plot multiple Beta probability distributions in a single grid using Wolfram Alpha: plot {beta distribution, alpha=10, beta=7}, {beta distribution, alpha=1, beta=4} However, ...
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### WolframAlpha - Is it possible to associate equations with theorems?

Suppose I wanted to find out about the Pythagorean Theorem by searching via WolframAlpha. This is trivial -- we can search directly for Pythagorean Theorem and get a wealth of information. But ...
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### Searching for populations of a list of cities

I want to create a list of all world cities named "Alexandria", along with their populations. Can a search engine do that? What could the query look like?
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### Derivative of tan(f(x,y))

I was looking at the derivation of the derivative of tan(x^2 + 5x + y) on the Wolfram|Alpha. I don't understand the last step, which says the derivative of y is zero. Shouldn't it be y? Here is ...
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### How to plot a scatter graph in Wolfram Alpha?

Is it possible to plot a simple scatter graph of points without any joining lines or lines of best fit? I have tried to use ListPlot but it just interprets that as plot which causes the points to be ...
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### How to get Wolfram Alpha to draw two different plots on the same graph?

I want to draw this line: ParametricPlot[{-2 (-5 + t), 5 + t}] And this circle, radius 25: ContourPlot[x^2 + y^2 == 25] On the same graph. No matter what combination I use, I can't get ...
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### Why can't Wolfram Alpha compute the following equation?

I tried to graph this equation I found on the Math SE on Wolfram Alpha,I got the following error: Wolfram|Alpha needs more time to respond to your query... When I clicked on Go on computing, I ...
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### Notation to ask Wolfram Alpha the next number in a pattern

If I have this pattern: 1 goes to 40 1000 goes to 1360 10000 goes to 3480 How do I ask Wolfram Alpha what 20,000,000 goes to? This is my attempt: http://www.wolframalpha.com/input/?i=1-%3E+40%2C+...
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### Can a user control the scale of plots in Wolfram Alpha?

I'm trying to generate some simple plots of shapes on the coordinate plane using Wolfram Alpha. I've had success with plotting the shape, but sometimes the plot output doesn't look nice. For example,...
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### How are the lines on HTML element hierarchy plots in Wolfram|Alpha generated?

Wolfram Alpha provides HTML element hierarchy plots for web sites. For an example, enter a popular website, like stackoverflow.com into the field: http://www.wolframalpha.com/input/?i=...
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### Plot vector-valued functions in Wolfram Alpha

Is there a way to plot 3d vector functions (also known as vector-valued functions) in Wolfram|Alpha? I know it's possible to plot regular vectors, by typing in vector {2,5,3} for example, but I would ...
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### Convert weight of food to volume in Wolfram Alpha

How can I use the volume of food in equations on Wolfram Alpha? For example, if I type: 60g flour, I see that at the bottom, it says: serving volume: 3.5 fl oz. How can I use this value in an ...
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### Show a number as binary in Wolfram Alpha

Is there any way to see a number as it's individual bits (i.e. base 2) in Wolfram Alpha? For example, given the number 255, it should show: 11111111 Similarly, the number 4 can be shown as: 100
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### Wolfram Alpha Competitors [closed]

Are there any sites that are similar to Wolfram Alpha, or is it currently unique?