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plot in logarithmic scale
The contourf function plots a plane, not a surface. To plot logarithmic contours of the ‘Z’ matrix, it will be necessary to c...

4 years ago | 0

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How to plot an equation with different parameter value?
Try this — x = 0:0.01:+10; c = [1;1.1;1.4;0.3]; Y = (1-x.^2).^c; figure plot(x,Y) legend(compose('c = %.1f',c), 'Locati...

4 years ago | 1

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Answered
How do you plot RMS of a Colormap?
Depending on the desired result, either use the rms function with the entire matrix (using the (:) convention to force it to be ...

4 years ago | 0

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Excel sheet time data defaulting to January 1st, 1970 on plot
My best guess is that datetime is not interpreting the time column correctly. It would need to be something like this: time...

4 years ago | 1

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Calculation of prediction interval for a new observation
The code is not doing a regression, so the ±95% confidence intervals on the vector would be the confidence intervals on the mean...

4 years ago | 0

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How to simply record a string of sound from the computer microphone?
The audiorecorder , recordblocking and audioplayer functions could be helpful. .

4 years ago | 0

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Using temperature and pressure data to estimate antoine coefficients for glycerol
Since both variable are present in the objective function equation, nlinfit (or lsqcurvefit) are not really good choices for thi...

4 years ago | 1

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IIR Filter Coefficant Value
I do not have access to R2010b and I have no idea what application that is. I would design the filter a bit differently, usin...

4 years ago | 0

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How to make circle in matrix form
I am not certain what th desired result is. This is the best I can do — k = 10; M = zeros(k); v = 0:0.2:k-2; x = ceil(...

4 years ago | 0

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how can i create an amplitude sweep?
Try these — t = linspace(0, 10, 500); s = sin(2*pi*t*10); figure subplot(3,1,1) plot(t, s) grid ylim([-10 10]) titl...

4 years ago | 0

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Answered
Is there a mistake in my code?
I might be better to estimate the parameters directly — x = [2.5 6 9]; % Exce...

4 years ago | 0

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Problem adding the large number with small number
The addition is made. It is necessary to display the appropriate precision to see it — a=6.3276e+16 b=17.3304 a_plus_b = ...

4 years ago | 0

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Answered
fcontour and fplot showing distorted images...
Separate the real and imag parts of the function and it works — syms k a b x e=exp(sym(1)); assume (a>0); %a=6; z(k,a)=(...

4 years ago | 1

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Answered
How can I determine the medium bias between 2 signals
The question is definitely ambiguous, since the signals themselves are neither displayed nor described. Perhaps subtracting t...

4 years ago | 0

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Why do I receive this error when using cumsum: "Invalid data type. First input argument must be numeric or logical." ?
The code (that appears to have been written in 2001) doesn’t make sense! The first argument to the function is ‘file_name’ th...

4 years ago | 0

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How to get multiple circles to rotate about a point
Try something like this — a = linspace(0, 2*pi, 30); r = 1:3; cm = colormap(turbo(numel(r))); figure for k1 = 1:numel(...

4 years ago | 0

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Struggling to plot the data over timestamps!
I am resisting the temptation to copy all of those, that should be in a text or spreadsheet file and attached here, anyway. I...

4 years ago | 0

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What should be the X, Y, and Z axes while plotting the contour plot?
If ‘sigmaX’, ‘sigmaY’ and ‘sigmaXY’ are vectors, use the griddata to create a matrix from them that can be plotted. Example —...

4 years ago | 1

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Answered
How can I fix this error?
The problem is that ‘G’ is a system object, not a matrix. To use smithForm on the ‘A’ matrix — Ad = [-3 5 -7 0; 0.5 -1.5 0.5 ...

4 years ago | 0

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How to generate a signal
I would use the interp1 function — x = linspace(0, 0.015, 41); % Independent Variable y = randn(size(...

4 years ago | 0

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I don't know what this genetic algorithm output graph means :(
The documentation describnes it better than I can, so I refer you to the documentation section on Plot Options. It describes al...

4 years ago | 0

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How to calculate the largest difference between peaks?
The findpeaks function can produce the ‘prominence’ value of each peak as the fourth output, p. I would use that value to deter...

4 years ago | 0

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Can anyone help me identify what is wrong with this code
Try this instead — for i=2:length(arr) diff(i) = arr(i) - arr(i-1) %I keep getting an error on line 4 end Be sure that ...

4 years ago | 1

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Real part of the Fast Fourier Transformed data file.
‘Any suggestions what might be the reason, do I have a mistake in the code?’ The code appears to be reasonable, although with...

4 years ago | 0

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error: fzero: zero point is not bracketed
Use fzero for numeric functions and solve for symbollic functions — syms x f=4*x.^2+20*x+4 x=vpa(solve(f==0)) format long...

4 years ago | 0

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Cumtrapz in a table does not work with datetime
Use the datenum function to convert the dates and times to decimal days and decimal fractions of days to use as the ‘x’ vector i...

4 years ago | 0

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bilinear interpolation of a 3D graph
Missing data, so I can’t run the code to demonstrate the approach. Since the data appear to be gridded (not scattered), the g...

4 years ago | 0

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How do I put peaks, prominences, widths and location in an array
Since ‘prominence’ is the first output of that particular findpeaks call, it has the values of the peaks, not their locations (t...

4 years ago | 0

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Answered
Trying to open/read a .xlsx file in MATLAB
The type function will display the contents of a file. The disp function (or simply removing the trailing semicolon from the ...

4 years ago | 0

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Separating numbers and letters
One approach — Coords = cell2mat(compose('%.1fN',rand(1,5)*100).') % Create Column ReadNrs = cell2mat(textscan(...

4 years ago | 0

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