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How to only change the sign without altering the font?
When I copy the sign from Windows Character Map and then explore it, your approach seems to work — figure plot([-10:-1]); % ...

mehr als 2 Jahre vor | 0

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How to find phase and frequency spectrum of signal?
A one-sided fft — t = -2:0.01:2; x = zeros(size(t)); x(t >= -2 & t < -1) = -1; x(t >= 0 & t <= 2) = -1; figure plot(t, ...

mehr als 2 Jahre vor | 0

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Daily and monthly moving averages
Use a timetable rather than a dataset. Then use the retime function.

mehr als 2 Jahre vor | 0

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Keep getting ERROR: Array indices must be positive integers or logical values for X(t)
Create ‘X’ as an anonymous function: X = @(t,C,Wd,Phase_Angle) (C.*exp(1).^-del.*Wn.*t).*cos ((Wd.*t)-Phase_Angle) % equation ...

mehr als 2 Jahre vor | 0

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In the case of a previously filtered signal, what methods can be employed to identify its filter characteristics?
If you have the original signal as well (before filtering), you can approximate the filter transfer function by taking the Fouri...

mehr als 2 Jahre vor | 1

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Finding the slope after drawing a trend/linear fit
Alternatively — files = dir('*.xlsx'); T1 = readtable(files.name) VN = T1.Properties.VariableNames; T = T1.T; x = T1.x; ...

mehr als 2 Jahre vor | 0

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How can I align deterministic signals?
Probably the easiest way to do this (with these signals) is simply to threshold the beginning of each to get the index, then use...

mehr als 2 Jahre vor | 1

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solve by the matrix method
Solving it symbolically — syms x1 x2 x3 x4 Eqns = [x1+2*x2-x3+x4==28 2*x1+4*x2-3*x3+x4==55 -4*x1+8*x2-12...

mehr als 2 Jahre vor | 0

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if loop for checking package weights and to calculate shipping costs
Try this — for package = [1 25 50 75 110] package % Package Weight In Loop (D...

mehr als 2 Jahre vor | 1

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How can I display axis ticks when using fill syntax?
The easiest way is to bring the ticks to the top layer — x = linspace(0, 1).'; y = x; figure fill([x; flip(x)], [zeros(si...

mehr als 2 Jahre vor | 1

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Calculate median values of slices of array associated with histogram bins
I would use another accumarray call: binmedians = accumarray(idx+1, (1:numel(idx)).', [], @(x)median(array2(x))) Creating d...

mehr als 2 Jahre vor | 0

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How can I add a horizontal dashed line with a text description above it to a specific coordinate?
Perhaps this — t = linspace(0, 5); k = 0.75; y = 5*(1-exp(-k*t)); yval = 3; tval = interp1(y, t, yval); figure plot(...

mehr als 2 Jahre vor | 0

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remove DC component of real time signal
The D-C component is the mean of the signal, so for a recorded signal, simply subtract the mean. Otherwise, since the D-C off...

mehr als 2 Jahre vor | 0

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Error: using fmincon and integral: Failure in initial objective function evaluation. FMINCON cannot continue
The ‘rhog’ variable must be defined in your workspace prior to using it as a function argument in ‘q’. EDIT — (14 Nov 202...

mehr als 2 Jahre vor | 1

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Factor P(x) with a degree of 4
One way to find out — syms x P = 5*x^4+3*x^3-6*x^2+x-4 x = vpa(solve(P)) x_real = x(imag(x)==0) x = vpa(root(P)) x_rea...

mehr als 2 Jahre vor | 0

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How to Plot Inverse Laplace with Heaviside?
Use the fplot function — clc syms s t Q = 10/(s*(s^2+100*s+1600))-10*exp(-3*s)/(s*(s^2+100*s+1600)); pretty(Q) q = ila...

mehr als 2 Jahre vor | 0

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Given an audio file, how can I construct a histogram of all bipolar pulses?
The findpeaks function can easily detect negative peaks. Simply negate the original signal to get them — t = linspace(0, 50...

mehr als 2 Jahre vor | 2

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how to calculate integral for combination of columns
One approach — T1 = readtable('ET1.xlsx', 'VariableNamingRule','preserve') [G,ID1,ID2,ID3,ID4] = findgroups(T1(:,1), T1(:,2...

mehr als 2 Jahre vor | 0

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How to plot a surface with lat, lon and depth?
You will need to create a matrix from your data vectors. (It would help to have the actual data.) Assuming they are similar ...

mehr als 2 Jahre vor | 0

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Add Text Tile to Tiled Layout
One approach — x = 0:99; y = randn(3,100); figure tiledlayout(2,2) for k = 1:3 nexttile plot(x, y(k,:)) g...

mehr als 2 Jahre vor | 0

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How can I use histfit function?
Your data are frequency data (probably the result of performing a histogram on an original data set), not actual histogram data....

mehr als 2 Jahre vor | 0

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How to interpret the frequencies on a symmteric FFT plot.
You need to use the fftshift function to put the zero frequency (D-C or constant offset) value in the centre. Then, depending o...

mehr als 2 Jahre vor | 0

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How to find the coordinates of contours when they go out of bounds and form multiple contours?
Here is my approach to this — load('contours.mat') pk = -32; [c2] = contourf(x2,y2,z35b, [pk pk] ,'ShowText','on',FaceAlpha...

mehr als 2 Jahre vor | 0

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How to combine columns from large dataset to datetime with correct vector or doublestring?
Use curly brackets {} instead of parentheses when referring to numbered table variables — Date=datetime(dataTable{:,3:5})+hour...

mehr als 2 Jahre vor | 0

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How can I selectively multiplying the negative values with (-1) in an excel file?
Multiplying the negative values of column 2 by -1 will of course create them as positive values for all the entries. Use the ...

mehr als 2 Jahre vor | 1

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How to estimate Y using a linear regression and an uncertain X value.
If I understand corectly what yoiu want to do, the best approach might be to use fitlm and then use the appropriate predict func...

mehr als 2 Jahre vor | 0

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Why does expm command work too slow?
If you want to multiply it by scalar or vector ‘t’, create an anonymous function rather than doing it symbolically — A_aug = r...

mehr als 2 Jahre vor | 1

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How to draw a semi circle filled with jet color (like in the image) ?
Try this — N = 250; th1 = linspace(pi, 3*pi/2, N); r = linspace(0, 1, N); z = r; x1 = r(:)*cos(th1); y1 = r(:)*sin(th1)...

mehr als 2 Jahre vor | 0

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Time-dependent parameter in ODE solver
The interp1 use in the documentation section for time-dependent parameters refers to vector arguments with a dependent variable ...

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Connecting different sets of 3D points
I assume the rows are the (x,y,z) coordinates, If so, try this — A_3Dpts= [-0.91, 0.53, 0.32; -.88, .51, .3; -.84, .43, .16...

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