Answered
Converting xlsx files to frequency domains using the fft algorithm
Try this — T1 = readtable('120mm.xlsx') VN = T1.Properties.VariableNames([1 4:end]); t = T1{:,1}; s = T1{:,4:end}; Ts = ...

1 month ago | 2

| accepted

Answered
creating a plot of one cycle from multipel cycles
This is called an ‘ensemble average’. One approach to it (I have posted several times on these problems) is in Combining repeti...

1 month ago | 0

Answered
I am trying to solve a system of three differential equations simultaneously
It ‘sort of’ has an analytic solution (if you want to let it run for a while, and then can make sense of that result), however i...

1 month ago | 0

| accepted

Answered
Solving a system of differential equations with a variable stored in an array
The value does not cause the curves to vary much. There may be other problems with your initial conditions for the outbreaks ...

1 month ago | 0

Answered
HD-sEMG data segmentation
Use the Signal Processing Toolbox buffer function on each column individually. The number of samples to use as the second arg...

1 month ago | 0

Answered
How to set as preferences radiant instead of degrees?
Functions have their own defined preferences. For example polarplot, sin, cos, tan, and most others require radian angle argume...

1 month ago | 0

Answered
italicize only a part of the legend
Use \it to begin it an \rm to end it. If you are doing that in an sprintf call, use \\it and \\rm respectively. text(0.4, 0...

1 month ago | 1

| accepted

Answered
import data from csv file with same format of stored data in file
The data are imported and stored with their original precision. They are just displayed with 4 digits to the right of the decim...

1 month ago | 0

Answered
How to exported formatted text and create files in array with specified variables ?
There are several ways to do this — VariantModel = compose('%c', 'A':'E') files = sprintf('''Model%c.$2k'' (or it may be .txt...

1 month ago | 0

| accepted

Answered
Issue with legend colours in scatter plots with tranparency set 'ON'
The legend function has at least two other undocumented outputs (those are all that I experimented with, anyway), that can chang...

1 month ago | 0

| accepted

Answered
How to add two different surface curves in a single plot?
Try this — ‘I want to add another surface to the same plot for the same data which is at z=1 and parallel to x- and y-axis.’ ...

1 month ago | 0

| accepted

Answered
connecting each data points in a bar graph with an error bar
Sure! The easiest way is probably to return the handles of the errorbar calls to get the ‘XData’, ‘YData’, ‘’YPOsitiveDelta’,...

1 month ago | 0

| accepted

Answered
Average data points of different X,Y range
You have too interpolate all the curves to a single common independent variable. Then you can average them. x1 = sort(rand(...

1 month ago | 0

| accepted

Answered
How to achieve symbolic numerical integration
Without knowing more about ‘chi’ and the characteristics of its integrated result, one option (especially if the integration lim...

1 month ago | 0

| accepted

Answered
High Frequency Noise baseline filter
Your data have broadband noise, so as might be expected, a frequency-selective filter is going to have very little effect. Prob...

1 month ago | 1

| accepted

Answered
How to interface symbolic solutions with numeric ode solvers
With an initially symbolic set of differential equations, the symbolic versions should not be part of a numerical integration. ...

1 month ago | 0

| accepted

Answered
How do I obtain the area of each contour on a contour3 plot?
I wrote some utility routines to get information from contour plots a while ago, and tweaked them for this project. The ap[proa...

1 month ago | 0

| accepted

Answered
How to plot direction of forces on a body with polar plots or similar?
I can’t figure out what you’re plotting. The data are vectors, so any sort of surface plot isn’t possible, and I don’t understa...

1 month ago | 1

| accepted

Answered
Can someone help me display the area bounded by the curve and the linear line. Pls see attached photo.
One approach — clear all; close all format shortG filename = 'GT+10-ubc-X-Axis - Static.csv'; T1 = readtable(file...

1 month ago | 0

| accepted

Answered
I want to find the least negative non positive number in a vector
Perhaps this — V = [-10 , -5 , -1 , -0.1 , 0 , 1 , 2 , 3 , 4 , 5] [Vmax,idx] = max(V(V<0)) V(idx) .

1 month ago | 1

| accepted

Answered
Plot Piecewise function graph
To do this in the Symbolic Math Toolbox, just write it essentially as in your original post — syms x f(x) = piecewise((-3*...

1 month ago | 0

Answered
Surf plot from excel file
It would help to know what the data are, and what you want to do with the NaN values. That aside, just plot all but the firs...

1 month ago | 0

Answered
How to Curvefit amplitude output of a spring-mass-damper system to find coefficients?
Try this — load('sampleData.mat') % whos objfcn = @(b,t) b(1) .* exp(b(2).*t) .* cos(2*pi*b(3)*t + b(4)) + b(5); Lvlm =...

1 month ago | 0

| accepted

Answered
Using string variable names for dot indexing
That approach can work, however it is necessary to put the variable name from the cell array in parentheses — varnames = {'rs...

1 month ago | 0

| accepted

Answered
Normalized graph not showing
The timeseries ‘out.Q_i_nd.Data’ is a 3D matrix. You need to use the squeeze function to remove the extra singleton dimensions. ...

1 month ago | 0

Answered
I am trying to plot a graph of two variables z1 and z2 versus t. but for some values of t I am getting z2 values negative in a graph. How to make these z2 values zero?
One approach — z2 = randn(1,10) z2(z2<0) = 0 .

1 month ago | 0

Answered
Want to truncate an array
There are a few options, including using the vpa function in the Symbolic Math Toolbox, and to use sprintf to display the values...

1 month ago | 0

Answered
bug in sprintf 2024a, can't use other variable and just repeating the first variable
The residue funciton produces column vectors in its output. To use sprintf with them, concatenate them in a matrix and then tra...

1 month ago | 0

| accepted

Answered
Graph lines not showing
See if the yline function will do what you want.

1 month ago | 1

Answered
Two sets of data with two date ranges and y-axis values
Try this — x1 = 1:250; y1 = 20*sin(2*pi*x1/100) + 20 + randn(size(x1))*5; x2 = 15:250; y2 = cos(2*pi*x2/150)*60 + 150 + ...

2 months ago | 1

| accepted