Muhammad Usman

Last seen: 27 giorni fa | Attivo dal 2011

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PhD (Scholar) Mathematics

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How to solve 2nd order BVP using Chebyshev Spectral Method?
Hi, I am tring to solve the following BVP using Chebshev Spectral Method: with boundary conditions: I am following the cod...

circa un anno fa | 1 risposta | 0

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Domanda

How to find the order of the power of A matrix?
Hi, I want to calculate the order of the power matrix A. Here order doesn't mean for rows into columns but the power n of the ma...

circa un anno fa | 2 risposte | 0

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How can I solve this?
% Solve the system of equations starting at the point [0,0,0]. % PL = x(1); c = x(2); k = x(3); % Initial guess is [0,0,0], yo...

oltre un anno fa | 0

Domanda

Problem in implementing Echelon Form and Solve System of Linear Equations
Here is my code: A = [3 2 1;-4 5 7;1 0 -9]; b = [1;4;5]; % Solving System of Linear Equations by using built-in command for i...

oltre un anno fa | 1 risposta | 0

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Domanda

How to do manual operation of cross multiplication or substitution?
If syms A B x y = A*x^2 + B*x; dy = diff(y) d2y = diff(dy) then how to get where d2y is the second derivation; using subs o...

oltre 2 anni fa | 1 risposta | 0

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Domanda

Optimize legend command?
Hi, I am struggling with LaTeX in legend, so far I wrote legend like: legendStrings = string(n); l = legend(legendStrings); s...

oltre 2 anni fa | 1 risposta | 0

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Domanda

What's the problem with this simple anonymous function?
Here's an simple code: clear all; clc; close all; n = 1:3; for i = 1:numel(n) %numel is used if someother time I'll use negat...

oltre 2 anni fa | 1 risposta | 0

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Domanda

How to adjust initial condition to nondimensionalization of coupled ODE?
Here is the code for dimenional and non-dimensional form of coupled ODEs using ode45, but both results are not agreeing. Please ...

quasi 3 anni fa | 0 risposte | 0

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Domanda

ODE solution using Fourier series
Hello, I am trying to solve first order ode () using Fourier Series. I wrote the code, but I was doing something, please idetif...

quasi 3 anni fa | 1 risposta | 0

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Domanda

Calling Euler Method to solve Shooting Method
Hi, I am trying to solve a BVP: y''(x) +5y'(x)+4y(x) = 1 with boundary conditions y(0) = 0 and y(1)=1 using shooting method. ...

quasi 3 anni fa | 1 risposta | 0

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Domanda

How to correct the regenerated plot of given analytical solution of ODE?
for for The analytical solution for this ODE is given belown and written as MATLAB in code routine: for t = -log(1-a)...

quasi 3 anni fa | 0 risposte | 0

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Domanda

Addition of numbers in array as string
I am following these lines of code, but generating error when I do: x = randi([0,9],1,20); y = randi([0,9],1,20); x_new = st...

circa 3 anni fa | 1 risposta | 0

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Domanda

Addition of numbers in array
Lets' say I have 2 vectors: x = [7 4 6]; y = [1 4 4]; But these are not just vector consider them as A number, i.e., 746 and ...

circa 3 anni fa | 1 risposta | 0

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Domanda

Plot with smaller variation in input argument under user defined function?
I am stuck with a smaller concept that How to Plot with smaller variation in input argument under user defined function? For ex...

circa 3 anni fa | 1 risposta | 0

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Domanda

How to save last three values from for loop?
I just got stuck to save the last three values of r from the for loop, please help me in this regard. yl = 1; rl = [0, yl] ; ...

oltre 3 anni fa | 1 risposta | 0

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Domanda

How to combine the result of for loop?
Here is a very simple line of code: x = 3; A = 1:x; for i = 1:length(A) y = repelem(A(:,i),i); Y = y(1,:) end I w...

quasi 4 anni fa | 1 risposta | 0

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Domanda

Sum and Difference across row and column
Let say there is square matrix of order n-by-n, and n is odd integer A = rand(3) A = 0.4218 0.9595 0.8491 0...

quasi 4 anni fa | 2 risposte | 0

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Trouble using fsolve with two non-linear equations and 3 parameter
I think it will works like in this way: function F = eql_coef(x) % x(1) == a % x(2) == d K_H2O = 20.999; K_OH = 1.0478; p ...

quasi 4 anni fa | 0

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Is this a bug in bar plot
I suggest you to use two additional lines of code highValue=10E15; y = [2 2 3*highValue; 2 5 6*highValue; 2 8 9*highValue; 2 1...

quasi 4 anni fa | 0

Domanda

merge mat files with different size?
Hi, Consider I have different .mat files and I want to merge them all and remove the repeated values, but the first problem I a...

quasi 4 anni fa | 1 risposta | 0

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Domanda

need help to plot a mesh
I just want to mesh plot a dirac delta function, can somebody help me to do so. I wrote some lines of code to plot dirac delta ...

oltre 4 anni fa | 1 risposta | 0

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Domanda

What is the error in this computation?
Here I want to plot a simple sum. I computed it manually by iterating different values, and then did it same by using for loop,...

oltre 4 anni fa | 1 risposta | 0

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Domanda

Error in computing numerical solution?
I am enable to compute numerical solution, as it generates weird Initial conditions (may be) compared to the inintial value of U...

oltre 4 anni fa | 0 risposte | 0

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Domanda

Spectral Method without FFT in MATLAB
Can somebody guide me that how spectral method will be implemented in MATLAB to PDE (lets say homogeneous heat equation with per...

oltre 4 anni fa | 0 risposte | 0

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Domanda

Specrtal Method for Heat Equation
I have one dimensional homogeneous heat eqaution. I want to solve it numerically using by supposing where Taking time deri...

oltre 4 anni fa | 0 risposte | 0

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How do i use boundary conditions to find variables in an equation
if you let Lp=constant and make changes in soln = solve(u,eqns,vars); to soln = solve(eqns); you will get a structure soln ...

oltre 4 anni fa | 0

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setting column of a matrix to zero
You haven't define constants a and z, and a vector mt, so I suppose a=-1, z=4 and mt=rand(1,50) and following lines of code to p...

oltre 4 anni fa | 0

Domanda

How to plot analytical solution in terms of Fourier Series
I want to plot the analytical solution of the equation given below: for x=-1:1 and t=0:0.4:2 for as suitable values of p. I...

oltre 4 anni fa | 1 risposta | 0

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Domanda

How can i plot an inline function?
I wrote a code in which i got and inline function as U = Inline function: U(p,t,x) = (372863112183097.*exp(500....

oltre 4 anni fa | 2 risposte | 0

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Adjust subscript style / height
use the following after the plot command xlabel("y_{" + n + "}", 'Interpreter', 'tex') %for alphabet and xlabel(" \Omega_{"...

oltre 4 anni fa | 0

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