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create yyyymm variable from date
Try this: dt = '1/1/2020'; Out = datetime(dt, 'InputFormat','MM/dd/yyyy', 'Format','yyyyMM') producing: Out = dateti...

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Resampling Data using Interp1
You are doing signal processing. For that, use the resample function. It will do the interpolation, and will also use an anti-...

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Can ode45 be used to solve mx'' + cx' + kx^1.1=0 x(0)=5;x'(0)=0? Getting complex numbers in answers.
You need to plot the real and complex parts separately. Assuming: [t,y] = ode45(yourOdefcn, tspan, ic); plot it as: fig...

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How to show numeric solution instead of symbolic solution
The ‘q_dot’ variable cannot be expressed as a strictly numeric array because it contains symbolic variables. The best you can...

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Jacobian matrix of a numeric matri
See if the gradient function will do what you want. That is likely as close as you can get for a numeric matrix. If it is a ...

6일 전 | 0

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Second Order ODE with Power
The best way to integrate it numerically is something like this: syms x(t) A B C D vb b Y t v=diff(x,t,2)==(A/x)*(B+C*(diff(...

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Running data through a filter multiple times
It is not easy to follow what you are doing here, especially with respect to your using the strings as part of the subscript (th...

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How to correctly apply bandpass filter to EEG data?
The bandpass function (and its friends) in my experience have all used filtfilt to do the actual filtering, so there should not ...

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findpeaks returns wrong width
If you have the Signal Processing Toolbox, use the pulsewidth function for this: D = readmatrix('test.csv'); A1 = D(:,2); t1...

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genetic algorithm for curve fitting
I would do something like this (with ‘M’ and the constants already existing in your workspace): MFit = @(c0,M0,h,z,z0) (M0 + c...

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remove first value that appears after sequence of NaNs
Try this: D = readmatrix('example_data.xlsx'); R01 = strfind(isnan(D(:,1)).', [1 0]); % Find Indices Of [0 1...

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I am trying to find the average of a 58 x 1000 matrix and the result should be a 58 X 48 matrix.
I am not certain that what you want to do is possible. I would normally suggest using reshape with it, then take the mean of ea...

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matrix dimension mismatch problem
The assignment to ‘Rb’ appears to be missing. Since you are using element-wise division wih it, it appears to be a vector, so I...

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confusion regarding interp1 command?
The two methods do not produce exactly the same results, however with respect to the amplitude of the values in the plot, they o...

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Allow Maximum frequency in FFT to be lower than the sampling frequency
The maximum frequency for a sampled signal is the Nyquist frequency, half the sampling frequency. Here: Fs = 262144; Fn = ...

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How to find the integral of some values?
use the trapz (or cumtrapz) function (depending on the result you want). It would be best to also have an independent variable ...

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How can I bring patch in front of a surface plot?
The patch call does not define the ‘Z’ level, so by default it is zero. Change that to put it where you want it (this puts it a...

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Enzymatic reaction modeling in MATLAB
You are not actually estimating parameters, however the example in: Parameter Estimation for a System of Differential Equations ...

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Growth kinetics ODE 15
The problem is here: Il=Io*exp(-sigma*x*l); since ‘x’ (and therefore ‘Il’) is a (7x1) vector, and it creates the right-hand-s...

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using surf and pol2cart on matrix
The matrix you have is actually the ‘Z’ matrix. You need to create separate radius and angle matrices of the same size (use ndg...

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Remove the legends for some lines in a plot
‘How can I get rid of those extra lines in the legend box?’ Refer only to the scatter plots by handle reference: LT = 0.5:9...

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If ode 45 uses internal step size then what is the utility to use delta T in the code?
I have no idea what you are asking. See if the documentaiton on tspan explains it.

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How to avoid undercase in plot legend?
Try this: legend('003_m1_30_90_ramp_20200611_200632_SNR_F1_PLL.mat', 'Interpreter','none') It ‘turns off’ the existing interp...

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Solving System of Differential Equations with Multiple Variables using ode45
If you assign ‘A(t)’ as ‘x(1)’ ... ‘F(t)’ as ‘x(6)’, then an anonymous function version would create this matrix: dfcn = @(t,x...

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How separate data from a table and convert every column in vector if this seáration depends on the label 'D' or 'E'?
Try this: C = { 111 90 50 'D' 321 80 50 'E' 121 70 ...

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Hi how do i plot a halfwave rectifier signal in matlab? i tried the coding below and only got the fullwave
To rectify it, use logical indexing to eliminate the parts of the signal that are less than 0: f=50; t=linspace(0,30,500); s...

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Convert Datetime to UTC
Try this: T = datetime('now', 'Format','yyyy MM dd HH mm ss', 'TimeZone','local') % Local Time Zone T.TimeZone = 'Z' ...

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How to include quiver plot in this 3d surface plot?
Try this: (EARLIER CODE OMITTED) figure surf(x,y,z1); xlabel('\bf{x}','fontsize',10); ylabel('\bf{y}','fontsize',10); z...

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Converting time variable in excel into datetime datatype
Assuming the date format and that the rows are character arrays, try this: dtc = '20190101:1700'; dt = datetime(dtc, 'InputFo...

12일 전 | 0

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Semilog x axis for Scatter Plot
The plot is working correctly. To more easily see that it is, add this xlim call (temporarily): xlim([0.01 10]*1E+5) .

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