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Bobby Fischer


Last seen: 1 day ago
23 total contributions since 2020

Bobby Fischer's Badges

  • Thankful Level 2
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  • Knowledgeable Level 1
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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...

1 day ago | 1 answer | 0

1

answer

Answered
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); ...

2 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...

4 months ago | 1 answer | 0

1

answer

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...

4 months ago | 1 answer | 0

1

answer

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...

4 months 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...

4 months 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...

4 months ago

Submitted


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

4 months ago | 2 downloads |

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Question


Matlab license expiration, now?
Now I get this message when I open Matlab: ---------------------------------------------------- Your MATLAB license will ...

4 months ago | 1 answer | 0

1

answer

Answered
confusion on a new schema for solving ode
Hello, function euler1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% clc clear tic delta_q=1e-4; q1=0;...

4 months 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...

4 months ago

Solved


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

4 months 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.

4 months ago

Answered
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...

4 months 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...

4 months ago | 1 answer | 0

1

answer

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 ...

4 months ago

Solved


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

4 months ago

Answered
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...

4 months 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? -------------...

4 months ago | 1 answer | 0

1

answer

Answered
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

0

answers

Question


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...

1 year ago | 0 answers | 0

0

answers

Question


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...

1 year ago | 2 answers | 0

2

answers