Star Strider

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14,894 total contributions 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

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Answered
high grade butterworth bandpass filter
Assign outputs: [z,p,k] = butter(10,[10 35]/1000); %10th-order butterworth bandpass filter then use zp2sos and use second-o...

21 minutes ago | 0

Answered
How to solve this equation in Matlab
Put everything on the right-hand side, so: f = @(d) expression - 30.19/d^2; then use fzero or fsolve or the Symbolic Math Too...

13 hours ago | 0

Answered
Why do I keep getting complex values from an if/else statement?
The problem is in the if block logic and the way MATLAB evaluates vectors. if r < 0.5 implies: if all(r < 0.5) that of co...

13 hours ago | 1

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Answered
Plotting Length vs Height
Without getting into the GUI itself, changing these lines (and their order): hp = ((f*(lp/D)*((V3^2)/(2*g)))-2.6681); % import...

14 hours ago | 0

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gone gone gone deleted
Try this instead: x = fmincon(@(x)fun(x,rM3, R3, rM4, R4),x0,A,b) I cannot run your code since I don’t have the file. I assu...

14 hours ago | 0

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how can i standardise the elements in a matrix
If you have R2018a or later, the normalize function will likely do what you want.

14 hours ago | 1

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Performance issues with readtable vs. xlsread
If you need to use xlsread, use it as long as you have it available. Since you obviously want the header information as well,...

19 hours ago | 0

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To smooth the noisy signal with integral
I believe you have the correct approach. I would do something like this: f = 1/20; t=0:0.2:50; noise = randn(size(t));...

21 hours ago | 0

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can Matlab solve such a symbolic integral?
I am not certain what you want. This works in R2020b: syms A w t x f = sqrt(A + (w*x + t)^2); fint = int(f,x); fint = si...

22 hours ago | 1

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Answered
How to find the average peak values and plot?
Try this: m=1000; I1=0.5; I2=0.3; I3=0.2; L1=70*m; L2=140*m; n1=2; n2=1.444; index=n2; lam=m*(1.5:0.000001:1.6); Q12...

23 hours ago | 1

Answered
Matlab legend wont match graph
See if this slight modification does what you want: legend([h1(1), h2(1), h3(1), h4(1), h5(1), h6(1), h7(1), h8(1)],'Solar Arr...

1 day ago | 0

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warning at the start of matlab software
See if this MathWorks Support Team explanation helps: Why do I receive the error "Warning: An error occurred while reading the d...

1 day ago | 0

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Answered
How do I read in this text file using fopen fclose and fscanf and then split each column into variables?
If you have R2013b or later, use readtable: T1 = readtable('car_data.txt', 'VariableNamingRule','preserve'); with: FirstFi...

1 day ago | 0

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Finding exponential decay of a*e^(-t*b)*sin(c*t) function
See if fitting it will do what you want. See for example How to filter noise from time-frequency data and find natural frequen...

1 day ago | 0

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How can one get parameters of fitlm as an output?
First, see the documentation for F-Statistic, then see the documentation for anova, specifically tbl.

1 day ago | 0

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Answered
How to make a meshgrid out of 1D data?
Using oinly two points could prove to be a challenge. The griddata function might be easiest for this problem, however griddedI...

1 day ago | 0

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Find the gradient using matlab code
You can do exactly what you want in either base MATLAB or using the Symbolic Math Toolbox. Please search the documentation us...

2 days ago | 0

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How to set the grid of the right yyaxis?
Another option is to create new right-axis tick positions to match the tick positions on the left: x1=[200, 300, 250, 520, 340...

2 days ago | 0

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Answered
Concatenate signals ( sine wave and a line )
You are attempthing to vertically concatenate them. Use commas (,) instead fo semicolons(;) and it will work. Commas horizon...

2 days ago | 1

Answered
Zone identification on curve
Try this: D = load('identification.mat'); var = D.var; x = 0:numel(var)-1; varfilt = sgolayfilt(var, 5, 271); Lmx = ...

2 days ago | 2

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Answered
Waveform Segmentation Using Deep Learning: Error on getmask
See if clicking on the Help radio buttion in the upper right corner of the MATLAB window, then scrolling down to Signal Processi...

3 days ago | 0

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How to use custom X values for the findchangepts function?
The findchangepts function outputs the change points as a vector of integer indices. To put them in the context of your data,...

3 days ago | 0

Answered
How do I pick specific rows of a txt file and plot data?
Try this: D1 = readmatrix('collagen405.txt', 'HeaderLines',14); x = D1(:,1); y = D1(:,2); figure plot(x, y) grid title...

3 days ago | 0

Answered
ODE45 must return column vector
Try this: I=[80,131,189,270,320,407,450,530,620,686,740,900,1095]; t2=[74,29,21,12,8,5.7,4.4,3.6,2.1,1.8,1.5,1.0,0.7]; a=....

3 days ago | 0

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Answered
How to plot timeseries graph
For the data posted, one approach: T1 = readtable('mar2014ctd.xlsx', 'VariableNamingRule','preserve'); VarNames = T1.Properti...

3 days ago | 0

Answered
Plotting a 3D surface model with colours from excel
I am not certain what result you want. One option: T1 = readtable('dagslysdata.xlsx', 'HeaderLines',3); Xv = linspace(min(...

3 days ago | 0

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Answered
I'm trying to plot this equation, if anyone can help
Take the square root of both sides, and plot: y = +sqrt(4*a*x); y = -sqrt(4*a*x); That’s how I would do it, anyway.

4 days ago | 0

Answered
Compass of complex matrix, getting "dot indexing is not supported for variables of this type."
See if this does what you want: c = compass (SOUSLEDNA); c1 = c(1); c1.LineWidth = 2; c1.Color = 'r'; .

4 days ago | 1

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Answered
Boundary line for contour
Sometimes, a bit of absolute creativity (‘thinking outside the contour) is necessary. I first did a meshc plot of your matric...

4 days ago | 1

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Answered
ODE45; Length of initial conditions vector not accepted
See if this does what you want: function ddx = odefcn(t,v,W,k,rho,S,R,m,P,c_Do) A_0 = (4.654*W*cos(t)*k)/(rho*S) - W*sin(...

4 days ago | 0

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