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Questions tagged [equations]

194 questions
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generating equation representations in python/on the web

Is it possible to take something like x^2+5 and have it generate this: https://i.stack.imgur.com/a0f8Q.gif I'll be using Python so anything based in Python would work, but I'm open to other solutions such as latex output.
tipu
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How to solve Exact Differential Equations in MatLab?

(3x^2+4xy)dx+(2x^2+2y)dy=0 I solve this equation on paper like that: The Result must be: f(x,y)=x^3+2x^y+y^2=c-c_1 I want to find f(x,y) function in Matlab. I tried to find it using dsolve command. dsolve ('(2*x^2+2*y)*dy=-(3x^2+4xy)',…
RedLEON
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Solving a difficult (polynomial?) equation in Python

I am new to programming (Python is my first language) but I love to design algorithms. I am currently working on a system of equations (integers) and I cannot find any references to solving my particular problem. Let me explain. I have an equation…
J W Jeff Helkenberg
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C API Library for Solving Sparse Systems of Linear Equations?

I need to solve a large, sparse system of linear equations from a program written in D. Ideally I'd like a library with a D-style interface, but I doubt one exists. However, D can directly access C APIs. Therefore, please suggest some libraries…
dsimcha
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Pygame bullet motion from point A to point B

I am trying to make a game with a python library called 'Pygame' (v1.9.2) and I have made a character for the player. This character is supposed to "shoot" "bullets" or "spells" to the point of mouse_pos and what I need help with is that the…
Feelsbadman
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f# query with equations

I am working on some code where I need to use an f# query to sum a list. For anyone who is working on f# basics, here's a handy link: https://learnxinyminutes.com/docs/fsharp/ So far, I have code that prints a statement for a sum of the square of 5…
EidahageFeroe
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What is the most efficient way to solve system of equations containing the digamma function?

What is the most efficient way to solve system of equations involving the digamma function? I have a vector v and I want to solve for a vector w such that for all i: digamma(sum(w)) - digamma(w_i) = v_i and w_i > 0 I found the gsl function…
Neil G
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Latex --- Is there a way to shift the equation numbering one tab space from the right margin (shift towards left)?

I have been formatting my dissertation and one little problem is stucking me up. I used the following code to typeset an equation \begin{align} & R=\frac{P^2}{P+S'} \label{eqn:SCS}\\ &\mbox {where} \quad \mbox R = \mbox {Watershed Runoff}…
Murari
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how to display math equations in block with markdown

In markdown quick reference, we know that one can display plain code in blocks by enclosing the code in ```. I wonder if there is a simple way to display math equations in block too. Thanks.
aonan zhang
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How Can I Solve Matrix Equation in Matlab

Say I have the following matrix equation X - B*X*C = D Where, X: 3 by 5, to be solved; B: 3 by 3; C: 5 by 5; D: 3 by 5; Is there any convenient method that I can use for solving the system? fsolve?
L.J
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Solving system of equations using matlab

So I have the following system of equations x1 - x2 = 20 x2 - x3 = 30 x3 - x4 = 75 x4 - x5 = -49 -x1 + x5 = -20 how would I solve the system using Matlab? I I'm a little stuck. There's a good chance there's no solution but if someone could…
Belgin Fish
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Free boundary conditions in MATHEMATICA - is this right? Second opinion

I'm trying to prescribe free boundary conditions for a non-linear evolution equation in mathematica and I wanted as second opinion on whether or not what I am doing is right. The boundary conditions have been marked with a comment, viz., (FREE…
dearN
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How to perform loan equations in Java?

I'm trying to make a program that will allow the user to determine different aspects when considering a loan. The first equation is supposed to determine what the monthly payment would be given the loan amount, interest rate, and number of months.…
Haley
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Is it possible to export some equations from a "WYSIWYG" math editor to PHP code

Writing complex equations in PHP is big deal so it would be easier if I could write them as "WYSIWYG" i.e. with MS Mathematics and export them instead of coding them. I checked out if I could use MATLAB but it can only export to C which would mean I…
MrRap
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Help debugging EvalMath's Undefined offset

Greetings and Salutations, My web application utilizes the EvalMath class found at PHPClasses. Unfortunately, it keeps generating approximately a 100 mb error log file each day because of this undefined offset error within the EvalMath class. It is…
Pie
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