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**Content Feed**

convert char to double

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

alrededor de 6 horas ago | 0

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...

alrededor de 6 horas ago | 0

| accepted

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/...

1 día ago | 1

| accepted

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 ...

2 días ago | 2

| accepted

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 ==...

2 días ago | 0

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...

3 días ago | 0

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) ...

3 días ago | 0

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 ...

3 días ago | 0

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') ...

4 días ago | 1

| accepted

Creating a matrix from one column

A = rand(1,1000)' M = repmat(A,[1 length(A)]) writematrix(M,'yourfile.csv')

4 días ago | 0

| accepted

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)); ...

4 días ago | 0

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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...

4 días ago | 0

| accepted

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.

4 días ago | 1

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...

4 días ago | 0

| accepted

Expanding Array as following;

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

5 días ago | 0

| accepted

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...

5 días ago | 0

| accepted

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; ...

5 días ago | 0

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 ...

7 días ago | 1

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...

10 días ago | 0

| accepted

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...

4 meses ago | 0

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 ...

4 meses ago | 0

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...

4 meses ago | 0

| accepted

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...

4 meses ago | 0

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...

4 meses ago | 0

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...

4 meses ago | 0

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 =...

4 meses ago | 0

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...

4 meses ago | 0

| accepted

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...

4 meses ago | 0

How to solve for three answers from 3 equations using fsolve

Below, see an example of how to solve the system. I had to make up the values of the constants since you have not specified the...

5 meses ago | 0

| accepted