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Questions tagged [equation-solving]

763 questions
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Matlab's solve: Solution not satisfying the equation

I am trying to solve equations with this code: a = [-0.0008333 -0.025 -0.6667 -20]; length_OnePart = 7.3248; xi = -6.4446; yi = -16.5187; syms x y [sol_x,sol_y] = solve(y == poly2sym(a), ((x-xi)^2+(y-yi)^2) ==…
Ankush
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Understanding one of the active contour algorithm equations

I'm working with a image segmentation using Active Contour Algorithm. I'm reading book 'Deformable Models: Biomedical and Clinical Applications'. There's is written how to apply this algorithm. I'm stuck because I don't undestant this highlighted…
Ugnius Malūkas
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Matlab solution for two graphs

I have a function f(t) and want to get all the points where it intersects y=-1 and y=1 in the range 0 to 6*pi. The only way I cold do it is ploting them and trying to locate the x-axis pt where f(t) meets the y=1 graph. But this doesn't give me the…
camelbrush
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More efficient algorithm preforms worse in Haskell

A friend of mine showed me a home exercise in a C++ course which he attend. Since I already know C++, but just started learning Haskell I tried to solve the exercise in the "Haskell way". These are the exercise instructions (I translated from our…
reish
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Find positive solutions to underdetermined linear system of equations

Consider a problem of the following: Find x_1, x_2, x_3 > 0 such that 67.5 = 60*x_1 + 90*x_2 + 120*x_3 and 60 = 30*x_1 + 120*x_2 + 90*x_3 In this case I want the solution 0 < x_3 < 3/7, x_2 = 7/20 - 4/10*x_3, and x_1 = 2/5 - 7/5*x_3 Is there…
htd
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Finding more than one root with root finding algorithms

What is the best way to find the roots of an equation with more than one root. I understand that no one method which can solve every equation, and that you have to use more than one, but I can't find a root finding algorithm that can solve for more…
user2280687
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How to solve n*log2(n)=A in matlab?

n*log2(n) = A, with A a known value. How do I solve for n in Matlab? Note that n isn't necessary an integer.
zoey
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PHP algorithm to solve a system of linear equations of grade 1

I have a system of equations of grade 1 to resolve in PHP. There are more equations than variables but there aren't less equations than variables. The system would look like bellow. n equations, m variables, variables are x[i] where 'i' takes values…
Daniel Ifrim
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Solving for unknown upper bound of the integral

I am trying to implement an algorithm in R that involves solving for the boundary limit of the integral. For example, I want to find a given the following integral: integral_0^a exp(x) = 1/2 I have a rough idea how to do it in matlab. But how would…
notrockstar
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I convert ASCII words into numbers but am stuck trying to decode them. How to convert 1=a, 2=b, 28=ab etc? (psudeocode okay)

So I thought I'd teach myself C++ but I appear to have no problems with the language but I am frankly stupid. So my idea was this. If I say a=1, b=2, z=26, aa=27 etc, I can map words to numbers, use a boolean in a hash table (bit masked of course)…
Philluminati
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Matlab Solve function solutions don't satisfy equation

I have an equation that theoretically has to only have one positive solution and the rest must be negative. So I used matlab solve function but two of the solutions are positive instead of one. Then as expected, by testing the solutions one of them…
Hafez Mousavi
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Solving Systems of Equations Symbolically Using Matlab

I have an optimization problem where I want to optimize the thicknesses t1, t2, t3 by solving them symbolically. The solutions should be approximately: t1 = 1.72053; t2 = 1.91395; t3 = 0.781725; %Given M_y = 2000000; %[Nmm] b …
Malte Grube
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Solving multiple solution equation in Python

I need to get the solutions of the following trigonometric equation: I know there exists either M or M-1 solutions depending on the value of $\Delta$. Does anyone know of any module or algorithm that I can use in Python for this task? I've tried…
amarouxo
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Trying to solve a system of non-linear equations using GEKKO. The system has multiple solutions, however GEKKO gives the wrong one. How do I fix this?

I am trying to solve systems of multiple non-linear equations similar to this one: As you can see by the graph, there are two solutions to the system. Through much trial-and-error and different methods (fsolve, etc.) to accomplish this, I stumbled…
sfarls
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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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