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Finding the gradient and the hessian of the same function
Read about gradient, hessian.

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How can I get the 3 minimum values of this plot?
REad about min. You have saved rmse of train, validatioon and testing. Use the function min and get the index. I would say check...

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DIFFERENCE BETWEEN SIGNALS AND PARAMETERS
Signals would be t vs amplitude plots. Parameters are charactersitics of signals such as amplitude, frequency, phase etc.

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a 3d plot but in a specific range
You pick your x,y to the given range. x = linspace(0,1) ; y = linspace(2,3) ; [X,Y] = meshgrid(x,y); psi_19 = (2*X) + Y ...

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Image processing code debugging
This line: P = regionprops(Iin, 'Perimeter'); Check the class of P class(P) It seems it is a structure and you can use it in...

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How to use interpolation?
Let lon,lat,U be your 2D data, and x,y,u be your buoy data. Ui = interp2(lon,lat,U,x,y) ; If your data is #d (I hope it is),...

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How to replace the zero with NaN in the specific column of cell arrays?
Let A be your m*3 array. A(A(:,2)==0,2)=NaN ; % repalce second column with NaN's A(A(:,3)==0,3)=NaN ; % replace third column ...

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Find x and y cordinates and t for z=0
Let x,y,z,t be yout required arrays. GEt the index of z where it is z = 0. Using this index, you can get what you want. tol = ...

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how do i plot this?
x=linspace(-2,6) ; f=(2*x./x.^2+1)-(x./sqrt(3*x+6)); %<--- element by element division plot(x,f)

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How to crop the image within certain limits?
Read about imfreehand, Freehand. If you know thoese certain values. Use contour to get the closed region of the required region...

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Inverse of a matrix in MATLAB and Python
You are to trying to fid the inverse of a singular matrix. A singular matrix is the one which doesn't have inverse. So different...

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How to write code for moments matrix?
https://in.mathworks.com/matlabcentral/answers/71678-how-to-write-matlab-code-for-moments https://in.mathworks.com/help/stats/...

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Problem reading double array from excel
REad about readtable

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Same code in a loop but different plots
area also supports linestyle, none. load('sample.mat') thr = [0.0057 0.0401 0.0090 0.0216]; t = (0:length(sample)-1)/2000;...

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Extracting text from a video
v = VideoReader('Large_Patron_Trim\Large_Patron_Trim.mp4'); N = v.NumFrames ; % Total number of rames ROI = [1008 215 50 3...

casi 4 años hace | 1

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BAR GRAPH plot - grouped legend
Refer this: https://in.mathworks.com/matlabcentral/answers/1670649-bar-plot-with-a-hatched-fill-pattern?s_tid=srchtitle https...

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Hatched Bar graph or Pattern bar graph
Refer this: https://in.mathworks.com/matlabcentral/answers/1670649-bar-plot-with-a-hatched-fill-pattern?s_tid=srchtitle

casi 4 años hace | 1

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Average intensity of an image
A = magic(5) ; [m,n] = size(A) ; iwant = 0 ; for i = 1:m for j = 1:n iwant = iwant+A(i,j) ; end end iwan...

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Why am i recieveing only one output even though my input is a matrix
You need to use element by element operations. clc; clear all ; clear all close all %hertzian contact calculator for a spher...

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How to use regression to find equation of data set?
x = [12 12.5 13 13.5 14] ; y = [61 61.5 62 62.5 63] ; [X,Y] = meshgrid(x,y) ; Z = [120 114 103 93 80 124 120 109 97 85 1...

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My code is returning a complex array
There is a typo in your code. x = -10:1:10 ; y = zeros(size(x)) ; for j = 1:length(x) y(j) = power(2.72,-0.2*j); %<--...

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i can not load load WaveformData
That matfile will be available in 2022b version. It seems you are using a lower version.

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2D interpolation of data
data = [1 1 7 2 3 9 3 5 8 4 6 4] ; x = data(:,1) ; y = data(:,2) ; z = data(:,3) ; F = scatteredInterpolant(x,y,z) ; xi...

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how can I calculate ocean current speed from u and v data?
Let u and v be the components. s = sqrt(u.^2+v.^2)

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Plot eigenvectors of a square matrix in Matlab
plot(Eig_vector)

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Using solution from vpasolve and syms for another function
A =[ 0 0 0 1.0000 0 0 0 0 0 0 1.0000 0 ...

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How can I make my code run faster?
c = zeros(size(d)) ; idx1 = d >= 0.05 ; c(idx1) = 1 ; idx2 = d < -0.05 ; c(idx2) = -1 ;

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repetitive looping and plotting
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1175788/newdata3.csv') ; data = reshape(T.(2),6000...

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Interpolation of missing matrix element
M = [43.13 0 42.88;0 39.32 0;41.81 0 43.27]; M(M==0) = NaN M = fillmissing(M,'linear') M = fillmissing(M','linear')'

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How to separate points under a line in a scatter plot
Refer the theory here: https://www.emathzone.com/tutorials/geometry/position-of-point-with-respect-to-line.html %Importing xy ...

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