Community Profile # Bobby Fischer

Last seen: 10 mesi fa Attivo dal 2020

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Domanda

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)...

oltre un anno fa | 1 risposta | 0

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Domanda

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?

oltre un anno fa | 0 risposte | 0

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Domanda

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...

oltre un anno fa | 1 risposta | 0

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Domanda

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...

oltre un anno fa | 1 risposta | 0

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Domanda

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...

oltre un anno fa | 1 risposta | 0

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Domanda

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...

oltre un anno fa | 1 risposta | 0

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Risposto
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); ...

circa 2 anni fa | 0

Domanda

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...

circa 2 anni fa | 1 risposta | 0

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Domanda

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...

circa 2 anni fa | 1 risposta | 0

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Risolto

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...

circa 2 anni fa

Risolto

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...

circa 2 anni fa

Risolto

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...

circa 2 anni fa

Inviato

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

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

circa 2 anni fa | 1 risposta | 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;...

circa 2 anni fa | 0

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Risolto

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...

circa 2 anni fa

Risolto

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

circa 2 anni fa

Risolto

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.

circa 2 anni fa

Risposto
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...

circa 2 anni fa | 1

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Domanda

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...

circa 2 anni fa | 1 risposta | 0

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Risolto

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 ...

circa 2 anni fa

Risolto

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

circa 2 anni fa

Risposto
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...

circa 2 anni fa | 0

Domanda

ode45 fail with pendulum
Hello. I have proof that in my machine the pendulum goes all the way around, contradicting reality. Any thoughts? -------------...

circa 2 anni fa | 1 risposta | 0

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Risposto
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...

circa 3 anni fa | 0

Domanda

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...

circa 3 anni fa | 0 risposte | 0

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Domanda

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...

circa 3 anni fa | 0 risposte | 0

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Domanda

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...

circa 3 anni fa | 2 risposte | 0

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