# Bobby Fischer

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**14** Questions

**5** Answers

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**Content Feed**

Question

Surf command to plot simple surface

Hi what is happening here: close all x = -1 : 0.1 : 5; y = x; [X, Y] = meshgrid(x,y); Z = 2*X - X*Y + 2*Y; surf(X, Y, Z)...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

Boundary value problem solvers in Matlab accept mixed boundary conditions, neumann boundary conditions?

Boundary value problem solvers in Matlab accept mixed boundary conditions, neumann boundary conditions?

ungefär ett år ago | 0 answers | 0

### 0

answersQuestion

simple fmincon problem, optimization toolbox

I have an optimization problem in that Matlab solves depending on the initial value given. First, I give X0 = [10 10 10] as the...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

Show stats in bvp4c

Hi, I would like to see the stats, like the number of iterations. I have 'Stats' 'on' but doesn't show anything. Thanks for yo...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

bvp4c's guess for boundary conditions

Hi. I'd like to know why the initial guess for the solution shouldn't always be the boundary conditions themselves. That is, why...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Light direction in surfl

Hi, I don't understand why it is not centered. x = -1:.1:1; y = -1:.1:1; [X,Y] = meshgrid(x,y); z = X.^2 + Y.^2; surfl(x,y...

mer än ett år ago | 1 answer | 0

### 1

answerPlot 2D data colormap

This could help: x = -3 + 6*rand(50,1); y = -3 + 6*rand(50,1); v = sin(x).^4 .* cos(y); F = scatteredInterpolant(x,y,v); ...

mer än ett år ago | 0

Question

Anomaly with comments and rating in one file in File Exchange.

https://www.mathworks.com/matlabcentral/fileexchange/85900-seawater-density-from-salinity-temperature-and-pressure I posted thi...

nästan 2 år ago | 1 answer | 0

### 1

answerQuestion

Function 'subs' different output for a (similar?) input

clc syms F(t) F(t)=[-5*cos(2*t) -5*sin(2*t) 3*exp(2*t); -2*(cos(2*t)+sin(2*t)) 2*(cos(2*t)-sin(2*t)) 0; cos(2*t) sin...

nästan 2 år ago | 1 answer | 0

### 1

answerQuestion

Matlab license expiration, now?

Now I get this message when I open Matlab: ---------------------------------------------------- Your MATLAB license will ...

nästan 2 år ago | 1 answer | 0

### 1

answerconfusion on a new schema for solving ode

Hello, function euler1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% clc clear tic delta_q=1e-4; q1=0;...

nästan 2 år ago | 0

| accepted

plot log with factor 20

Hello a=1.03; h=(a^200-a^20)/9; ypoints=a^(20):h:a^200; xpoints=log(ypoints)./log(a); figure(1) close(1) figure(1) h...

nästan 2 år ago | 1

| accepted

Question

Discrepancy with easy ODE.

Hello, don't know why the discrepancy. function fcno y0=linspace(0,2,20); t0=linspace(0,3,100); figure(1) close(1) figure...

nästan 2 år ago | 1 answer | 0

### 1

answerHow to solve 'Index exceeds matrix dimensions.' error?

Hi, there was a bunch of things to correct. Don't know if the result still has some value because I don't know what I was workin...

nästan 2 år ago | 0

Question

ode45 fail with pendulum

Hello. I have proof that in my machine the pendulum goes all the way around, contradicting reality. Any thoughts? -------------...

nästan 2 år ago | 1 answer | 0

### 1

answerHow can i plot surfaces for a recursive function?

Hi, I have written this code. Is this what you meant? function []=bobby_98(n) lon=20; x=linspace(-1,1,lon); y=x; z=zeros(l...

mer än 2 år ago | 0

Question

Start new session everytime

Hi, I would like Matlab to open with the command window and no editor tabs open. That is, if I had editor tabs open in my last...

mer än 2 år ago | 0 answers | 0

### 0

answersQuestion

Quadrature rectangles transparency in plot

Hi, How can I change the transparency of the rectangles? function [I]=bobby_85(n) % n=30; n=300; p=1; h=1/(n-1); I=0; x...

mer än 2 år ago | 0 answers | 0

### 0

answersQuestion

How to fix axes in dynamic plot

Hi, I would like to fix the axes in this dynamic plot right from the beginning. Is there an easy way to do it? Thank you. cl...

nästan 3 år ago | 2 answers | 0