Community Profile Bobby Fischer

Last seen: 4 months ago Active since 2020

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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

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Question

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

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Question

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

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Question

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

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Question

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

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Question

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

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Plot 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

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Question

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

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Solved

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. Question

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

1 year ago | 1 answer | 0

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confusion 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

Return area of square
Side of square=input=a Area=output=b

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

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Solved

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

Solved

Given a and b, return the sum a+b in c.

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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How 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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Question

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