How can I solve this complex 4 equation with 4 unknowns variables
You can specify 'MaxDegree' as input to solve() syms K1 K2 K3 K4 equ1 = K2+K4-36 equ2 = K2*K4+K3+K1-486 equ3 = K2+2*K2*K3+2*...

1 year ago | 0

Do I need to uninstall another version of MATLAB before installing an new version with different products?
MATLAB installations are independent of each other. You can delete the previous installation directory directly before installin...

1 year ago | 0

| accepted

Contour plot of XYZ data
Try this x = hfm(:,1); y = hfm(:,2); z = hfm(:,3); xg = linspace(min(x),max(x)); yg = linspace(min(y),max(y)); [Xg, Yg] ...

1 year ago | 0

How to find inverse kinematics given D-H parameters?
First create a rigidBodyTree from dh parameters: https://www.mathworks.com/help/robotics/ref/rigidbodyjoint.setfixedtransform.ht...

1 year ago | 0

| accepted

Building an Neural network with multiple inputs
The 10 in the line feedforwardnet(10, 'trainlm'); have nothing to do with the number of inputs. You can put any number here. I...

1 year ago | 0

| accepted

Questions about making websites that run user applications
One option might be to use the MATLAB App server, but it seems that it is basically designed for an organization's internal use,...

1 year ago | 0

How to hide web browser while using web function
Which function are you using to download the data? You can use websave(): https://www.mathworks.com/help/releases/R2020b/matlab/...

1 year ago | 0

machine eps related query
It happens because of finite precision of double() precision datatype: https://en.wikipedia.org/wiki/Double-precision_floating-p...

1 year ago | 0

| accepted

Add markers to a contour plot
It is not possible with single call of contour(). You need to hold the axes and then make a seperate call to plot() or scatter()...

1 year ago | 0

| accepted

How to Use?: New "Name=Value" Syntax for 2021a
I don't have access to R2021a, but I guess it is supposed to be something like this plot(XData,YData,'LineStyle=-','MarkerSize=...

1 year ago | 0

How can I generate an Impulse Train of specific Sampling Frequency?
Try this T = 1; x = -5*T:5*T; stem(x, ones(size(x))) ylim([0 1.5])

1 year ago | 0

how do I shade area under graph with specific x interval?
Try something like this a=10; t=0:0.1:200; c_L=0.2.*(1-exp(1).^(-1/a.*t)); t_shade = 60:0.1:200; c_L_shade = 0.2.*(1-exp(...

1 year ago | 0

| accepted

Solving Equations in MATLAB
There is no general solution to such a problem. A common way is to specify several starting points for the numerical solver and ...

1 year ago | 0

| accepted

How can I generate the Hankel matrix using the measured datapoints?
Try something like this y = [0 1 3 5 7; 0 2 4 6 8]; k = 2; % Y rows in output matrix [m, n] = size(y); i = hankel(1:n); i...

1 year ago | 0

| accepted

displaying RGB colours using SURF.
You can use texture mapping to display an RGB image on a surface(). See here: https://www.mathworks.com/matlabcentral/answers/91...

1 year ago | 0

how to calculate the average for each row of cell array
First use cell2mat() and then apply mean() along rows R_mean = mean(cell2mat(R), 2)

1 year ago | 1

| accepted

How to add trendline to scatterplot?
Something like this x = [2 1 4 68 4 5] y = [5 4 2 23 21 50] p = polyfit(x, y, 1); px = [min(x) max(x)]; py = polyval(p, ...

1 year ago | 2

| accepted

Generating and plotting functions.
The exponent also contain abs() function. You can write it like this t = -1:0.1:3; y = exp(-abs(t)/5); plot(t,y) Also, the u...

1 year ago | 0

Why unifrnd(lb,ub,[nPop,D]) gives error?
This cannot be done in single call to unifrnd. You need a for-loop lb = [0 0 0 0]; ub=[10 10 pi pi]; nPop=30; D = numel(lb); ...

1 year ago | 0

Calculating mean of different ranges in a Table
There are several ways to do this in MATLAB. Following shows one option M = rand(900, 10); C = mat2cell(M, 300*ones(size(M,1...

1 year ago | 0

| accepted

How can I add column with for loop
The question is not clear. Are you looking for something like this url = {'nam1', 'nam2', 'nam3','nam5', 'name5', 'nam6'}; x...

1 year ago | 0

Phase portrait of the system in a rectangle
You can use quiver(). For example, [x,y] = meshgrid(linspace(-1,1,20)); dx = 2*x-y-5; dy = 3*x-2*y-9; quiver(x, y, dx, d...

1 year ago | 0

| accepted

Interpolation over datetime for 2 arrays
Your data is not directly in the correct format for interp1(). You first need to pre-process your data. For example CGM_date = ...

1 year ago | 0

| accepted

Use square brackets instead of parenthesis in the definition of eqns syms t1 t2 t3 t4 t5 t6 eqns = [-0.7591*t1+0.3789*t2 == -...

1 year ago | 1

| accepted

function repeat number?
combvec() from the Deep learning toolbox is most easiest solution a = [1 2 3] b = [1 2 3] C = combvec(a, b).'; % if the order...

1 year ago | 1

| accepted

Calculate the mean of multiple 3D arrays layer by layer
I am not sure why you are concerned about the layers. You are just taking an element-wise average of two matrices. Talking about...

1 year ago | 0

| accepted

How do I create a function that solves systems of linear equations of N size?
"Is it possible to make a function like this?" Yes. Just name it something else, since size() is a built-in function. x = mySi...

1 year ago | 0

function day is not working in matlab 2020a
Function day() is defined for datetime input arguments. For example >> t = datetime('now'); >> day(t) ans = 21

1 year ago | 0

| accepted