# Tagged Questions

Questions on the analytic and numeric equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).

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### Solving two non-linear equations with two unknowns [duplicate]

I'm a beginner in Mathematica. I'm trying to solve : ...
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### FindRoot, How to Return Null After x Number of Iterations

I am using FindRoot to find the root of a function, say f(x), and going through a loop for different values of ...
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### How to solve an equation where the unknown variable is inside the integration [closed]

I have an equation: $$\frac{1}{g}=\int_0^{\frac{1}{\delta}\sinh \frac{1}{g}} \frac{\tanh\left(0.882\, b\,\delta\sqrt{1+z^2}\right)}{\sqrt{1+z^2}}\mathrm{d}z$$ I want to obtain the relation ...
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Given that I have a set of equations about varible $x_0,x_1,\cdots,x_n$, which own the following style: $\left( \begin{array}{cccccccc} \frac{1}{6} & \frac{2}{3} & \frac{1}{6} & 0 & ... 0answers 36 views ### Assign the results from a Solve to variable [closed] I am a new user. I know, that my question was already asked billion times before, for example here, but I still cannot adopt these answers to my problem. In my problem I am solving the equation and a ... 1answer 58 views ### Newbie Issues with Solving & Plotting a System of equations I'm having some problems with my mathematica code, I think I'm overlooking something simple. I get valid solutions for u0 thru u4, but it doesnt generate any plot at all. Also, I'd really like to plot ... 0answers 119 views ### Solving in Mathematica I am trying to solve system of equations and inequalities in Mathematica. I am having the doubt that how much of preliminary processing should I do before solving. For example, consider a system of ... 0answers 61 views ### NIntegrate over statistical variables with parameter Essentially, what I am trying to do is the following: Integrate a function which contains the parameter k ... 2answers 167 views ### Does LinearSolve know that I gave it a Sparse lower triangular matrix? Let$\mathbf L$be a nonsingular numeric (non-symbolic) large, lower triangular sparse matrix. Let$\mathbf b$be an appropriately sized vector. I want to solve$\mathbf L\mathbf x=\mathbf b$. ... 2answers 75 views ### Solving a system of vector equations I had a problem where I had to solve a series of equations where some of the variables can take multiple value such as shown below ... 1answer 90 views ### Find Values of a and b for a Limit I am having trouble finding the values of a and b for which$\lim \limits_{x \to 0}(\frac{\sin (ax) + bx)} {(x^3)}) = -32/3 $. In Mathematica I have entered: ... 2answers 86 views ### Evaluation to true using DSolve - syntax errors? Probably a stupid question, apologies, but I am getting an annoying error when I try to evaluate the following simple PDE$\frac{\partial C}{\partial t} = d \frac{\partial^2C}{\partial x^2}$between ... 2answers 127 views ### Numerical solve question Why does this work? Solve[5 Tan[t] + 9 == 0 && 0 <= t < 2 Pi , t] {{t -> π - ArcTan[9/5]}, {t -> 2 π - ArcTan[9/5]}} But this doesn't. ... 0answers 76 views ### Solve a simple vector equation I have a vector x = {1, 2, 3} and I want to solve for y such that 5 + x == y which ... 2answers 159 views ### How do I solve for a variable inside a sum but independent of the summation index? How would I go about solving the following for c? Solve[0 == Sum[(t[i]*m[i] - c*t[i]^2)/s[i]^2, {i, 1, n}], c, Reals] I get ... 1answer 73 views ### Reducing solutions of Sin[2t] Sin[t] == Cos[t] to a simpler form [closed] I evaluated Solve[Sin[2 t] Sin[t] == Cos[t] && 0 <= t < 2 Pi, t] And got these results. ... 0answers 75 views ### Extending Bresenham's algorithm for subpixel rendering Original Bresenham's line drawing algorithm it limited to drawing lines between two integer pixel positions and does not allow subpixel rendering. However with my reformulation of this algorithm as a ... 1answer 94 views ### Solve equation with sum in it Have trouble to solve this equation. Anybody knows where're the problems? ... 2answers 154 views ### Bifurcation diagram for 1D ising model I'm new in Mathematica, I want to plot a bifurcation diagram for a complicated Ising system with dynamics that I'm working on, but to get familiar with how to perform it on Mathematica I wish to start ... 1answer 32 views ###$Failed when naming the variable x [closed]

Total beginner here, the problem goes away when renaming x into other letters. Below is the code ...
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