Star Strider

Last seen: Today | Active since 2012

Hic sunt dracones! PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

Statistics

All

View badges

Content Feed

Answered
I exported data from excel into a table, how do I sum the values of each column from that table excluding NaN's
Two options — T = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1005700/Inventory.xlsx') S1 = nan...

etwa 7 Stunden ago | 0

Answered
How to overcome the problem with the function diff used to approximate matrix derivative.
Use the gradient function instead of diff.

etwa 10 Stunden ago | 0

Answered
How to interpolate a column array based on another non-linearly spaced column array?
As a general rule, it is best to interpolate a longer vector to a shorter vector in order to avoid creating data that interpolat...

etwa 13 Stunden ago | 0

Answered
Incorrect use of '=' operator for an IF statement
I usually do something like this in setting an index range — L = numel(Componentry_New) for k = 1:Whatever Level_Either_...

etwa 14 Stunden ago | 0

Answered
Trying to learn how to add a threshold trigger and peak markers.
Try something like this — x = linspace(0,10,500); red_line = sin(2*pi*x)*1.5; trigger = find(diff(sign(red_line - 0.95)));...

ein Tag ago | 0

| accepted

Answered
What does this Digital filter actually do? and what is it called?
It is a 2D FIR filter: I am not certain it has any other name. To see what it does, plot its results — H = [1 1 1 1 1;1 2...

ein Tag ago | 0

Answered
How to add date and time in a plot by command in matlab 2012?
I no longer have access to R2012a, so I cannot test this with it. The code you posted works correctly in R2022a, however R201...

ein Tag ago | 0

| accepted

Answered
Three columns (x,y,z) in table, Loop through table for each X plot Y vs Z
Try this — CA = {'A' 1 3 'A' 2 4 'A' 3 10 'B' 1 4 'B' 2 4 'B' 4 6 'C' 0 1 'C' 1 4 ...

ein Tag ago | 0

| accepted

Answered
How to implement a for loop on figure plotting?
Try something like this f = 1:500; Q = randn(115,500); idx = 1:100; % Choose Specific Columns fi...

ein Tag ago | 0

Answered
I want to find the area of the graph
Try this — LD = load('x,y.mat'); x = LD.xy(1,:); y = LD.xy(2,:); yf = sgolayfilt(y, 3, 1001); ...

2 Tage ago | 1

| accepted

Answered
Can "datetime" be responsible for the misalignment of data in a plot ?
The first cluster of data (at about 2.5 or about 18 Jun) appears to be perfectly aligned in both plots. The datetime plot goes...

2 Tage ago | 1

| accepted

Answered
How can I add uncertainty to a data matrix?
The repmat funciton is likely not needed. Just do something like this: h = h + randn(size(h)); and so for the rest. See t...

3 Tage ago | 0

| accepted

Answered
ERROR: Array indices must be positive integers or logical values. Can anyone please help, Thank You!
I suspect the problem is with this term — u(u*UmaxN_0+PsByN_0*u) and everywhere else something similar to that is used. The ...

3 Tage ago | 0

Answered
Why doesn't my state-space model iterate?
The iterations are defined inside the function. See the documentation section on Display to see the progress of the estimation....

3 Tage ago | 0

Answered
How to FFT my xlsx files from time domain to frequency domain?
Try this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1000730/delay%2040ms%20speed%20100%2...

3 Tage ago | 0

Answered
Extend a cell array of dates (from days only, to hours and days) in a compact way
Try this — C1 = {'17-Jun-2017'; '30-Jul-2017'} DT1 = [datetime(C1{1}) : days(1) : datetime(C1{end})]' DT2 = [min(DT1): hou...

4 Tage ago | 1

| accepted

Answered
How to utilize 'symsum' in this case?
Try something like this — syms i j t Y Eq = symsum(Y,j,2,5) * (symsum(t,i,1,j)^2 - symsum(t,i,1,j-1)^2) .

4 Tage ago | 0

Answered
I am trying to find the integral gain (ki) of the following transfer function.
Symbolic variables are not permitted in Control System Toolbox objects, however anonymous functions are. Try this — sys = @...

4 Tage ago | 0

Answered
Scatterplot with two x and y axes only showing one dataset
The code only creates one tile: t = tiledlayout(1,1); Changing it to: t = tiledlayout(1,2); or: t = tiledlayout(2,1); a...

4 Tage ago | 0

Answered
How to solve third order equation using ode45
I let the Symbolic Math Toolbox do everything — syms y(t) T Y Dy = diff(y); D2y = diff(Dy); D3y = diff(D2y); Eq = D3y - D...

4 Tage ago | 1

| accepted

Answered
COnvert x,y, time array into 3D matrix
Try this — xyt = [1, 3, 2 1, 3, 2.3 1, 3, 2 1, 3, 2.1 1, 3, 2.4 4, 5, 1 4, 5, ...

4 Tage ago | 0

| accepted

Answered
how can I change the code to have only unique CDF and PDF plot?not for all samples
I am not absolutely certain what you want. If you want one plot for the first and last subplots, rather than multiple lines i...

4 Tage ago | 1

| accepted

Answered
Need explanation on plotting frequency response of a causal discrete-time LTI system implemented using the difference equation.
‘does it mean H=RH_coeff, w=LH_coeff?’ No. The first argument are the numerator coefficients of the filter transfer function...

5 Tage ago | 1

Answered
Obtaining value of highest order derivative over simulation period
One option would be to use the gradient function on the second column of the differential equation output (the integrated functi...

5 Tage ago | 0

Answered
bandpass filter design from low-pass iir filter
See if the lp2bp function will do what you want.

5 Tage ago | 0

Answered
How to make a table of strings from a table of numerics
I’m not certain what you want, however substituting compose for sprintf may be appropriate — arr = [1;2;3;4]; T = array2table...

5 Tage ago | 0

| accepted

Answered
3d surface plotting of spherical coordinates which i have in csv
Apparently, the angles sent to sph2cart were in degres, not radians. Try this with the complete file — M = [20 0 ...

5 Tage ago | 0

Answered
Help on ploting bar graph using table
There are mismatches between the number of names and the number of variables, and a missing comma between ‘Protein L’ and ‘Prote...

5 Tage ago | 0

| accepted

Answered
Modifying 3D plot
There are only two points, so I am not certain what you want for the others. One option could be to use stem3 instead — x =...

5 Tage ago | 0

| accepted

Answered
removing pops/clicks from audio file
The filloutliers function (or one of its friends) could be an option — [y,Fs] = audioread('https://transfer.sh/fR2wht/vinyl.mp...

5 Tage ago | 0

| accepted