Answered
How to plot 3D filled contour ?
It would help to know the data and the desired result. One option is to use the surf function and contour3 — [X,Y,Z] = peak...

4 years ago | 0

Answered
Using ode45 for a non linear differential equation with a term in a vector form
I do not understand the problem. Is the objective to estimate a parameters of the differential equation from data? The tim...

4 years ago | 0

| accepted

Answered
why do I get an error "First input argument must be a function handle"
I have no idea what the code does. See if this paproximates the desired result — nUn = 2000; nU2n = 1500; nU3n = 200;...

4 years ago | 1

Answered
I need help solving RC circuit using Leplace inverse, then graph the output which is in the symsum form
Sometimes a bit fo force (such as using vpa) is necessary — syms s t Ys2(s)=((2*s^2+7*s+3)/(2*s^3+11*s^2+15*s+4)*(2*s+2)/(...

4 years ago | 1

| accepted

Answered
2D contour plot with given matrix
Two possibilities — M = [25, 25, 25 111.5, 137.8, 245.1 146.3, 178.3, 296.4 111.5, 137.8, 245.1 25, 25, 25]; figure ...

4 years ago | 0

| accepted

Answered
from curve fit to look up table
The question is a bit ambiguous. Interpolation of some sort would appear to be the best option, and of course the approach de...

4 years ago | 0

Answered
Curve fitting for multivariable
There are several options. I’m using fminsearch here. xdata = ... [0.882263937 0.882263937 0.882263937 0.882263937 0...

4 years ago | 0

| accepted

Answered
Change x axis increments
See Axes Properties, specifically XScale, YScale, ZScale. .

4 years ago | 0

Answered
How can I make a single letter or specific letters bold without using the latex interpreter for title, axis, and labels?
Se the Interpreter property in the text documentation. The default interpreter is 'tex', and it is possible to use it with any ...

4 years ago | 1

| accepted

Answered
How can I add conditions to a system of equations?
Use the assume function — syms q w e r t y u i o real assume([q w e r t y u i o]>=1 & [q w e r t y u i o]<=9) eqn1= (w*r)/...

4 years ago | 0

| accepted

Answered
Plot fitting curve (x,y) in 3D (x,y,z)
One option is the waterfall plot. I would start with it. . .

4 years ago | 0

| accepted

Answered
Mesh Plot surface dimensions must agree
The easiest solution in that instance is either to reverse the first two arguments to surf or transpose the ‘Z’ matrix. .

4 years ago | 1

Answered
Calculating gradient of f in point A?
Create them as functions — syms x1 x2 f = x1 + x2^2; A = [5, 6]; f_grad_diff(x1,x2) = [diff(f, x1), diff(f, x2)]; f_grad...

4 years ago | 0

| accepted

Answered
How do i find the ZCR of a speech signal?
The easiest way is to use the zerocrossrate function in the Signal Processing Toolbox (however that likely amounts to cheating)....

4 years ago | 0

Answered
How to perform global sensitivity analysis on a set of data
This is new to me. The only reference I was able to find (other than the SimBiology functions) is this GitHub link Global sensi...

4 years ago | 2

| accepted

Answered
PLOTTING BAR GRAPHS with different colors
Try this — A = rand(1,400); x = 1:400; figure hb = bar(x, A); hb.FaceColor = 'flat'; hb.CData(1:10,:) = [ones(10,1) z...

4 years ago | 0

| accepted

Answered
How to create a diagonal matrix that starts at (1,1)?
Without using repmat — n = 4; lambda = 0.2; A = diag([0 ones(1,n)]*lambda) ,

4 years ago | 0

| accepted

Answered
first two inputs must have the same number of elements error(hw deadline soon)
Check the code to be certain that the first two input arguments are the same length. If they are not, change the code so that...

4 years ago | 0

Answered
Indexing a vector in a particular fashion
Index it pretty much exactly as ot was written — v = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; idx = [9, 10, 7, 8, 5, 6, 3, 4, 1, 2]; ...

4 years ago | 0

Answered
can't fing notching filter
First, the bandstop function is likely an effective substitute. Second, both FIR and IIR notch filters are straightforward to...

4 years ago | 0

Answered
How to split an array of tot seconds in windows of 60 sec haveing also windows without values?
I am not certain what the desired result is, however if I guess correctly the buffer function may be the solution. .

4 years ago | 0

Answered
I want to plot two spheres. It appear as ellipses. Can anyone help me?
Adding axis('equal') solves it! a=1; L=0.1; dd=5; c =-a/L; b =a/L; m =a*60; % [x,y]=meshgrid((c+...

4 years ago | 0

| accepted

Answered
Too Many Input Arguments
This works (with and without the norm call) — v = [0.1, 0.1, 0.1, 0.1, 0.1]; [B,fv] = fminsearch(@kinetics123, v) ...

4 years ago | 1

| accepted

Answered
loop for species names
Try this — Species = @(n) strrep(compose('C%dH%d', [n(:) 2*n(:)+2]), '1H','H'); Hydrocarbon = Species(1:5) Back to my ...

4 years ago | 1

| accepted

Answered
How to calculate the subtended angle ?
See my Answer to How can I calculate the angles between a polygons vertices? for an approach that appears to work. .

4 years ago | 0

| accepted

Answered
x,y,z values in 3d plot
Perhaps this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/807724/URM_shear_EPX1.xlsx', '...

4 years ago | 0

| accepted

Answered
3D plot from excel
Thanks for quoting my code! The second column ‘Y Coordinate (mm)’ is identically zero. The griddata function will of course ...

4 years ago | 1

| accepted

Answered
Stopping the automation of a 10 x 1 into a 10x10 matrix in Matlab.
Use element-wise dividion (./) iunstead of (/) in the acos call — theta = acos(n./d) EDIT — See Array vs. Matrix Operations...

4 years ago | 0

| accepted

Answered
Need to find cutoff frequency using frequency spectrum
I essentially already did all of that in my Answer to I want to remove 50 Hz noise using fir notch filter in ECG .

4 years ago | 0

Answered
I want to remove 50Hz noise using fir notch filter in ECG signal
That is straightforward — Fs = 1000; % Use Correct Sampling Frequ...

4 years ago | 0