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Star Strider


Last seen: Today |  Active since 2012

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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)

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Answered
if elseif else statement not working
Use a logical vector to select the elements you want to plot, then use that as a subscript to both arguments in each plot call —...

14 hours ago | 0

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Answered
How to find Maximum Likelihood Estimation of Images?
Use the mle function. However according to the documentation section on data the input must be a vector, so the call to it woul...

19 hours ago | 0

Answered
Retime Yearly Maximum - Finding Corresponding Dates from Timetable
Try something like this — Date = datetime(2020,01,01)+caldays(0:3.9*365.25).'; Temp = 80*rand(size(Date))-40; Humd = randi([...

2 days ago | 0

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Answered
find equal value into cell
Use the ismember function after using the cell2mat function. I am not certain what references you want, so it may be necessar...

3 days ago | 0

Answered
Error when using findpeaks for different limits
My error was in misinterpreting the error message ‘< 8759’. The upper for limit should be ‘numel(EFFEKT)-2’ instead. Then, i...

3 days ago | 0

Answered
Help with Laplace transform method for 2nd order DE
In the subs call, use curly braces {} instead of square brackets []. Then, it works — syms s t y(t) Y g = heaviside(t)*(si...

3 days ago | 0

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Answered
How do I get Symbolic/simplify to replace 1-cos(theta)^2 with sin(theta)^2 etc.
Without having the longer expression to experiment with, perhaps rewrite or subexpr could work.

3 days ago | 0

Answered
Problem with ordinary differential equation
The initial condition of 0 for keeps it 0 througuout the integration. syms y(x) x Y N=5; r=0.05; m=0.01; p=1; s=1; t=...

3 days ago | 0

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Answered
Can I rename the dependencies of an anonymous function?
I am not certain what you want to do, however it seems that you want to compbine both of the arguments into a single vector. ...

4 days ago | 0

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Answered
convert html content to table
It appears to be an Excel file in a website. Perhaps using readtable would work. If not, then perhaps first using websave migh...

4 days ago | 0

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Answered
How can I load my .mat files from a folder into a function?
The ‘data’ variable contains a structure (see struct for details) holding all the variables in the file. See the documentation ...

4 days ago | 0

Answered
How to combine 2 graphs from different scripts in another script
I cannot get copyobj to copy the data for both figures to one axes. It copies some of the informaton, however not all of it. T...

4 days ago | 0

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Answered
Shifting audio signal into different frequency band (shiftPitch)
I do not have the Audio Toolbox, however the documentation for shiftPitch requires the argument to be either single or double. ...

4 days ago | 0

Answered
Overlaying Surface and Vector Plot
Ideally, both plots need to be 3D plots, otherwise the surf plot will completely hide the quiver plot, since the quiver plot has...

5 days ago | 1

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Answered
Error when using findpeaks for different limits
The 'MinPeakDistance' value must be less than the number of elements in the vector being used as the first argument to findpeaks...

5 days ago | 0

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Answered
How to fix ode graphs?
You are telling it to produce two different plots because of two separate figure calls. syms y(x) x Y N=5; r=0.05; m=0.01...

6 days ago | 0

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Answered
Arrange column vetors into table
You simply need to transpose the row vectors to column vectors. That is best done before creating the table, for example — ...

6 days ago | 0

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Answered
How can I create a matrice with values over a number of this matrix ?
Perhaps something like this — earthquakes = rand(20,1)*9 % Data (Richter Magnitudes) eq_gt7 = eart...

7 days ago | 0

Answered
Uploaded images are pixelated
JPEG images have problems because of the discrete cosine transform used to encode them. See the Wikipedia section on JPEG compr...

7 days ago | 0

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Answered
Converting a timestamp into a value that can be plotted
A duration array may woirk, although a datetime array would also work. Perhaps something like one of these — ts = ['11/04/2...

8 days ago | 0

Answered
Find intersection point between two plotted lines
The code I wrote for your previous post, Plot tangent line on part of the curve is designed as requested to have only one inters...

8 days ago | 0

Answered
Plot tangent line on part of the curve
Try this — Data = readmatrix('data_tangent.xlsx') x = Data(:,1); y = Data(:,2); [ymax,idx] = max(y); Binit = x(1:5) \ ...

8 days ago | 0

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Answered
How to add missing rows in irregularly spaced table as per missing months and years?
I am not certain what you want to do, however the correct approach to dealing with the missiing values is to convert the table t...

8 days ago | 1

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Answered
How to use the constant e?
Use the exponential function exp(y) to compute e^y. For example:  x = 0.2; Result = (x^2)*exp(4) Result = 2.1839

8 days ago | 15

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Answered
Error envelope/shaded bar on stair plot
The stairs funciton is not a ‘normal’ plot. (It used to be possible to get the actual line coordinates that it plots, however t...

8 days ago | 0

Answered
How to change xticks on a histogram?
There are several ways to do this. Using xticks should work in R2022b — T2 = array2table(rand(100,10)*10); ...

8 days ago | 0

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Answered
Issue when input to sin(x) is in scientific notation
You are seeing the effects of different precision arguments. format long % Show Detai...

8 days ago | 2

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Answered
Issues with creating a frequency weighting filter for a iso-standard
I just saw your latest Comment now. The sampling frequency can be anything that you determine to be appropriate for the syste...

8 days ago | 0

Answered
Find crossing points of x and z data
It would help to have the data, and labeling the axes, since it is not obvious what ‘x’ and ‘z’ are. In their absence (and ma...

9 days ago | 0

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Answered
Sketch the graph using matlab
Use the linspace function to create the ‘x’ vector. Use element-wise operations to calculate ‘y’: y = (x.^3-1)./(sqrt(x) - ...

9 days ago | 0

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