# Tagged Questions

For help with mathematical questions arising from software such as Maple, MATLAB, Mathcad, Pari/GP, R, and the WolframAlpha website, etc. Consider posting questions about Mathematica at the Mathematica StackExchange instead. For GAP, SAGE, and MAGMA, one might use tags (computer-algebra-systems), (...

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### No graph shown on Microsoft Mathematics

When I try to graph this formula, $$y=\sum^x_{n=1}[n*\sum^n_{m=1}\sin(\frac{m}{n})]$$, the graph shows nothing. I thought it is possible that I input it in wrongly or the software can't solve this ...
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### Is there a good program to download or online for plotting certain functions in 3d?

I am interested in a program that can plot me, without too much trouble shapes in 3d, when I type in the function. For example a elliptical paraboloid and an ellipse of the same time, so I can analyze ...
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### Amount of zero in a range

I'm stuck with a calculation. If a person would write down, Everytime he sees a zero and counts +1. 10 counts as 1 zero. 100 counts as 2 zeros. 1000 has 3 zeros. 1005 counts as 2 zeros. Is there ...
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### MathCad Variable Undefined (even though I just defined it)

Hoping to run into some mathcadders: I have a worksheet which includes the following except (and error) Any help?
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### Polynomials as sum of squares

Sometimes I have seen some math's competition problem solutions made by completing the expression as sum of squares. What is the intuition/computer program behind these solutions? For example, Prove ...
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### Program for playing around with aperiodic tilings

I know this is technically a software question, but I figure the mathematicians here would know more about it: I'm looking for software to play around with different "paintings" (different patterns ...
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### Automatic solver of four-color theorem? [closed]

Does anyone know of an app/online tool to automatically colour any map or image using the 4-colour theorem? (Taking a Black and white image as input).
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### What is wrong with this code (SCILAB)?

i wrote this on scilab: function q=arrow(x0,y0,z0,a0,r,s) j=1; ...
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### How to perform a quasiconvex optimization

I have a quasiconvex objective function $f:\mathbf{R}^n\rightarrow \mathbf{R}$ which I would like to minimize over a simplex $S\subseteq \mathbf{R}^n$. I have looked pretty hard but have been unable ...
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### Graph a function of two variables online, with the output rendered as color

Are there any online utilities to graph a function of two variables online, with the output rendered as color in some way (for example, red to green, black to white, hue, etc...) Wolfram Alpha comes ...
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### Octave Graph Plotting: Axis when x and y = 0

By default, when I plot a graph, the axis seems to be at the lower limit x=linspace(-10,10,20) y=4*x+2 plot(x,y) How can I have the axis when x=0 & y=0, ...
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### Given a line segment from $A$ to $B$, and a scale of your view of space $sx, sy$, how do you preserve width of line?

So I'm using PyQt5 to do 2D rendering for an LED light show creator app. The light shows are graphs where the $Y$-axis is LED brightness level and the $X$-axis is usually time. I have a zoom feature ...
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### Running time comparison of algorithms

Which math software or programming language one should use in order to compare run times of two number theoretic algorithms ? I use PARI/GP but I am not sure if this is a right choice .
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