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Array indices must be positive integers or logical values.
That notation only will work in the Symbolic Math Toolbox. Use Anonymous Functions to create functions for numeric calculations...

5 years ago | 0

Answered
How to convert consecutive numbers in NaN?
Try this — y = [1 2 3 5 2 6 4 8 0 5 2 0 0 0 0 0 0 0 0 0 0 1 2 5 6 9 8 74 0 0 0 32 8 4 6 1 10 2]'; y = [y;y;y; zeros(8,1)]; ...

5 years ago | 0

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Answered
Counting amount of digit occurrence in a cell
Try something like this — CellArray = num2cell([2; 2; 2; 2; 2; 2; 2; 3; 9]); [Uc,~,ix] = unique([CellArray{:}],'stable'); Co...

5 years ago | 1

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Answered
Interpreting FFT Graph with Noise Floor
Try this — X = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/613760/tapedata.csv'); t = readmatr...

5 years ago | 0

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Answered
Bar plot how to create it
Use the bar and plot functions. The cross-hatching is not a standard option, so it will likely be necessary to simply use sol...

5 years ago | 0

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Answered
i have Question about Inverse lapalce transform & plot
Try this — syms s R = 1/s G = 75/(s)^2+10.25*s+100.65 F = R * G a = ilaplace (F) % x = t t = [0 10]; y = a; fplot(y,t)...

5 years ago | 0

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Answered
Changing size label in xline
Try this — x = linspace(0,6,100); y = exp(x); plot(x,y) hxl = xline(4.5,'-',{'Acceptable','Limit'}); x = linspace(0,6,...

5 years ago | 0

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Answered
Is there FWHM function in frequency domain
Try it — a = 2; p = @(t) exp(-(a*t).^2) t = linspace(-5,5); figure plot(t, p(t)) grid P = fft(p(t))/numel(t); Ts ...

5 years ago | 0

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Answered
How to use 'trapz' command in a foor loop
The problem is that ‘S_v’ has only one non-singleton dimension (i.e. it is a vector). That is throwing the error. Chan...

5 years ago | 0

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Answered
Matlab solves differential equations but returns empty plots
It is not possible to do anything with the images provided. Perhaps something like: Fds = vpa(Fds) figure fplot(Fds) a...

5 years ago | 0

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How to rotate 3D surface matrices
It depends on what you want to do. To rotate the surface in the axes, use the rotate function. To change the viewpoint (ca...

5 years ago | 0

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Answered
Plot discrete fourier transform of a sine wave
Try this — f = 6000; fs = 16000; w = 2*pi*(f/fs); N = 50; n = 0:N; y = sin(w.*n); subplot(2,1,1); stem(n,y); f = -...

5 years ago | 1

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Answered
Develop a cleaner stem plot (Magnitude Spectra)
These are two-sided fft plots. I’m not certain what ‘cleaner’ is in this context, however using the fftshift function, then c...

5 years ago | 0

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Answered
How to solve Coupled Differential Equations
Try this — syms x(t) y(t) x0 y0 Dx = diff(x); Dy = diff(y); ode1 = Dy-Dx == 2 - x ode2 = 2-Dy - Dy == 3 + 2*y S = dsolve...

5 years ago | 0

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How to interpolate a matrix ?
Try this — M=[ 3.2 5 4.1 4 5.6 3 6.7 ...

5 years ago | 0

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Answered
Vector counting syntax help?
Try this — A = [1 1 1 1 2 3 3 5 5 5 5 6 6 7]; [Au,~,ix] = unique(A,'stable'); Count = accumarray(ix,1); Result = table(Au(:...

5 years ago | 0

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Answered
How to get multiple variables in 'assume' ?
Declare them in the syms call as positive. MATLAB defines positive as values greater than 0. See the documentation section o...

5 years ago | 1

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Answered
signal does not show filtered, using filter()
Use freqz to see what the filters are actually doing — Fs1 = 500; %Sampling Frequency ync = [.25, .5, .25]; ync1 = [-.085 ....

5 years ago | 0

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Answered
Trying to fit parameters for an ODE model to real data using lsqcurvefit
‘... I can't seem to find any real differences between the code I've constructed and that example.’ I agree that the initial ...

5 years ago | 0

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Answered
how take a mathematical function from user
I would use the inputdlg function — prompt = {'Enter f(x,y):', 'Enter g(x):'}; response = inputdlg(prompt) f = str2func(['@(...

5 years ago | 0

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Characteristics of a step response plot
Try something like this (using a transfer function from the documentation) — sys = tf([1 5 5],[1 1.65 5 6.5 2]); stinf = step...

5 years ago | 2

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I want to separate the signal from the noise with the help of a low pass filter.
I could not figure out which of those signals you want to filter, so I arbitrarily chose ‘t1’ and ‘y1’. They are not consiste...

5 years ago | 0

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Answered
How to change X axis in the form of percentage
Try something like this — x = linspace(77, 146); y = -60 - 15*sin(2*pi*x/50); figure plot(x, y) Ax = gca; xt = Ax.XTick...

5 years ago | 1

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Plotting a filter as a function of cyclic frequency using freqz()
Your approach is correct. The reason the freqz plot did not look correct is that you were passing the filtered signal to it, no...

5 years ago | 0

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Answered
How to tell matlab that y is a function of x; not a constant
In the initial syms call, declare ‘y(x)’ instead of ‘y’ — syms x y(x) z z=x*y; Dz = diff(z,x) ...

5 years ago | 1

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Answered
Adding text to each subplots
Use xlim and ylim to make the text positions relative to the axes — x1 = linspace(0,10, 25); y1 = exp(-0.1*x1); x2 = linspac...

5 years ago | 0

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Answered
Error in App Designer " Undefined function 'sym2poly' for input arguments of type 'char'.."
Apart from the app code, apparently the numerator and denominator polynomials are not being transofmred into symbolic variables....

5 years ago | 1

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Answered
CIplot unable to fill on log-x axis
I am not certain what you are doing. However in many situations, it is easier to initially plot in a linear scale, then afterwa...

5 years ago | 0

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Answered
Numerical integration using Trapz
That should produce one scalar value as ‘F’, so the subscripts are not necessary. I would do something like this — F = trap...

5 years ago | 0

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Answered
Data is not importing? SOS
It is not importing because the correct approach to reading .wav files is to use audioread. Try that. It should do what you ...

5 years ago | 0