# 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)...

4 months 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?

5 months 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...

5 months 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...

5 months 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...

7 months 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...

9 months 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); ...

10 months 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...

1 year 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...

1 year 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...

1 year 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...

1 year 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...

1 year ago

Submitted

Fourier series finite expansion.

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

1 year ago | 1 download |

Question

Matlab license expiration, now?

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

1 year ago | 1 answer | 0

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answerconfusion on a new schema for solving ode

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

1 year 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...

1 year 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.

1 year 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...

1 year 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...

1 year 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 ...

1 year 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...

1 year 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? -------------...

1 year ago | 1 answer | 0

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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...

1 year 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...

1 year ago | 0 answers | 0

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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...

2 years ago | 0 answers | 0

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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...

2 years ago | 2 answers | 0