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*...

mer än 3 år 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...

mer än 3 år ago | 0

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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] ...

mer än 3 år 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...

mer än 3 år ago | 0

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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...

mer än 3 år ago | 0

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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,...

mer än 3 år 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/...

mer än 3 år 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...

mer än 3 år ago | 0

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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()...

mer än 3 år ago | 0

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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=...

mer än 3 år 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])

mer än 3 år 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(...

mer än 3 år ago | 0

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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 ...

mer än 3 år ago | 0

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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...

mer än 3 år ago | 0

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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...

mer än 3 år 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)

mer än 3 år ago | 1

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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, ...

mer än 3 år ago | 5

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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...

mer än 3 år 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); ...

mer än 3 år 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...

mer än 3 år ago | 0

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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...

mer än 3 år 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...

mer än 3 år ago | 0

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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 = ...

mer än 3 år ago | 0

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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 == -...

mer än 3 år ago | 1

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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...

mer än 3 år ago | 1

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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...

mer än 3 år ago | 0

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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...

mer än 3 år 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

mer än 3 år ago | 0

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