Answered
Solve 2nd order ODE using Euler Method
Hi Matt - a second order ODE can be decomposed into two first order ODEs. The secret is to set 2 variables y as The you have...

nästan 2 år ago | 0

Answered
convert char to double
var = '0'; out = str2double(var) whos out No need to use regular expressions at all, at least in Matlab.

nästan 2 år ago | 0

Answered
How to plot implicit ODE?
You need to solve it first. The ODE can be easily made explicit Then you can use any Matlab ODE solver (see this documentati...

nästan 2 år ago | 0

| accepted

Answered
How to plot this feather using a mathematical equation
There: clear,clc [x,y] = meshgrid(linspace(-0.4,0.9,1000),linspace(-1.5,1.1,1000)); xy = x-y/8-(1/8)*(y+1).^2; A = 1+1/...

nästan 2 år ago | 1

| accepted

Answered
How to solve systems of non linear equation of dimensions 100 using ode45 matalb.
If I were you, I would proceed substantially differently. Since you need to solve 100 equations, it is unthinkable to cde them ...

nästan 2 år ago | 2

| accepted

Answered
I would like to plot row 1 and row 3 of B as (x vs y plot graph).
I suspect you want something like this syms x y z for i=1:10 eqn1 = 2.*x + 2.*i.*y + z == 2; eqn2 = -x + y - i.*z ==...

nästan 2 år ago | 0

Answered
Force a starting point on exponential graph
See if this can help counts = [2423970,2171372,2065862,1830553,1100899,1037972,914015,752138,684123,606126]; normalized_counts...

nästan 2 år ago | 0

Answered
Sum groups of columns
Example M = rand(10,4600); n = 50; for idx = 1:size(M,2)/n S(idx) = sum(M(:,n*(idx-1)+1:n*idx),'all'); end size(S) ...

nästan 2 år ago | 0

Answered
I'm new in using Matlab and I'm very confused of how I would solve a derivative problem. Here is the equations and problem
I think what you have in your snapshot is already ok. You just need to save the functions in y1, y2 and y3. There are also some ...

nästan 2 år ago | 0

Answered
How to terminate the MATLAB code?
n = 100000000; a = 3.8; x(1) = 0.5; tic Time = 0; for i=1:n if Time > 5 fprintf('You run out of time') ...

nästan 2 år ago | 1

| accepted

Answered
Creating a matrix from one column
A = rand(1,1000)' M = repmat(A,[1 length(A)]) writematrix(M,'yourfile.csv')

nästan 2 år ago | 0

| accepted

Answered
How I can add an exponential fit to my cdfplot?
I guess you could do something like this load z x = linspace(0,1,length(z)); fitfunc = fittype(@(A,B,C,x) A*exp(B*x.^C)); ...

nästan 2 år ago | 0

| accepted

Answered
Use of 'ArrayValued' in Matlab numerical integration
Let's take a look at the error message f = @(x) 5; integral(f,0,2) The important line here is "Output of the function must be...

nästan 2 år ago | 0

| accepted

Answered
How to display only few values in a plot rather than for whole points in a big array?
n = 10; plot(x,T(:,1:n:end)); By increasing the value of n you decrease the number of lines shown in your plot.

nästan 2 år ago | 1

Answered
how to calculate biokinetic parameters?
You can use MatLab's fit function. Let me give you an example. Let us assume you have the following set of 50 experimental valu...

nästan 2 år ago | 0

| accepted

Answered
Expanding Array as following;
Try this A = [1 0 0 1]; B = repelem(A,3) For more info see the documentation for repelem.

nästan 2 år ago | 0

| accepted

Answered
Determine the magic sum from a magic square
I think you are inputting the magic square itself to your function, rather than its order. I believe the relation between a mag...

nästan 2 år ago | 0

| accepted

Answered
remove indent in command window
I do not know you can change the way the editor looks, but you can print the result so that it looks the way you want. b = -3; ...

nästan 2 år ago | 0

Answered
SIR model with recovered individuals may lose their immunity and become reinfected with the disease. But came with a failure about integration tolerances
I guess the problem is in this three lines S = beta*S*I + delta*R; I = beta*S*I - gamma*I; R = gamma*I - delta*I; where you ...

nästan 2 år ago | 1

Answered
Find Index of Max Value in One Matrix and find value of that index in another
You can do it this way force = rand(1,10); length = rand(1,10); [max_force,idx] = max(force); max_length = length(id...

nästan 2 år ago | 0

| accepted

Answered
max value in each row with its index
inputmatrix= [8.0000 0 7.3398 0 8.0000;... 1.6635 0.7103 3.2000 3.2000 3.2...

ungefär 2 år ago | 0

Answered
Save for loop outputs into structure
Does allBIN(n).corr work?

mer än 2 år ago | 0

Answered
How to replace non consecutive value on a vector?
You could write a function that scans your array in search of the pattern you specify and replaces it with another. clear clc ...

mer än 2 år ago | 0

Answered
How to solve coupled partial differential equations with method of lines?
Hi @Ari Dillep Sai, take a look at the code below. The breakthrough now is found to be sometimes after 4000 s (or ~67 mins), so...

mer än 2 år ago | 1

| accepted

Answered
How to import multiple text files from multiple folders and take maximum from each text file
Hey @Nazanin Farsi, based on your replies, maybe the following code will work. n1 = 1:22; n2 = 0.1:0.1:1.3; max_value = zer...

mer än 2 år ago | 0

Answered
How to import multiple text files from multiple folders and take maximum from each text file
clear,clc n = 0.1:0.1:1.3; for k = 1:length(n) filename = [num2str(n(k)),'pga/AllMaxDrift.out']; data = read...

mer än 2 år ago | 0

Answered
Newtonian interpolation polynomial that interpolates f twice (value and 1st derivative)
If the problem is the error appearing in your question, i.e. Function definitions in a script must appear at the end of the fil...

mer än 2 år ago | 0

Answered
how to get x value of findpeaks
If X is your array of x-values, do [peaks,locs] = findpeaks(smoothed{i},'MinPeakHeight',0.5,'MinPeakDistance',200); x_peaks =...

mer än 2 år ago | 0

Answered
vector that displays [0 5 10 15]
Just be aware of the fact that you do not need to use a loop to do this A = 0:5:15 That said, if you really must use a loop, t...

mer än 2 år ago | 0

| accepted

Answered
Finding indices of a vector within a matrix
Let me propse the following example clear,clc A = rand(100); A = A > 0.5 B = cell(1,100); for col = 1:size(A,2) idxs...

mer än 2 år ago | 0