# Bobby Fischer

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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)...

meer dan een jaar 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?

meer dan een jaar 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...

meer dan een jaar 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...

bijna 2 jaar 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...

bijna 2 jaar 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...

ongeveer 2 jaar 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); ...

ongeveer 2 jaar 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...

meer dan 2 jaar ago | 1 answer | 0

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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...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerSolved

Select every other element of a vector

Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

meer dan 2 jaar ago

Solved

Generate a vector like 1,2,2,3,3,3,4,4,4,4

Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

meer dan 2 jaar ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

meer dan 2 jaar ago

Submitted

Fourier series finite expansion.

I did this to learn grosso modo how Fourier series work.

meer dan 2 jaar ago | 2 downloads |

Question

Matlab license expiration, now?

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

meer dan 2 jaar 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;...

meer dan 2 jaar ago | 0

| accepted

Solved

Finding Perfect Squares

Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

meer dan 2 jaar ago

Solved

Maximum value in a matrix

Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

meer dan 2 jaar ago

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...

meer dan 2 jaar 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...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerSolved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

meer dan 2 jaar ago

How 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...

meer dan 2 jaar 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? -------------...

meer dan 2 jaar 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...

ongeveer 3 jaar 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...

ongeveer 3 jaar 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...

ongeveer 3 jaar 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...

meer dan 3 jaar ago | 2 answers | 0