Answered
How do I make a 3D surface from table data?
Use the scatteredInterpolant function to generate the ‘Z’ matrix — T1 = readtable('Table Matlab surface.xlsx', 'VariableNaming...

3 years ago | 1

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Answered
Cannot extract real or imag part of a function
You are taking the real and imag parts of a function handle. It is necessary to evaluate the function handle first. Try thi...

3 years ago | 1

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Answered
toggle percentual from matrix
Perhaps this — per=5; a=magic(4) apr = a*(1-0.05) % 95% Of The Value apr = a*0.05 ...

3 years ago | 1

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Answered
Why I knock into a error when I want to get data from my double?
In ‘PCI1’ you are referencing ‘R’ however you are not passing it to ‘PCI1’ as an argument. Perhaps this — R = [[1 0.9954 0...

3 years ago | 1

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Answered
Unexpected flat surface with surf command
I do not completely understand the problem, however: [X, Y] = meshgrid(sort(x), sort(Dp_values)); could solve the problem. ...

3 years ago | 0

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4 equation 2 solution
Since ‘Phi’ and ‘L3’ are not defined, I created them (and ‘Alpha’) as parameters to be estimated hiere. I am not certain wh...

3 years ago | 0

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Answered
for loop with fminsearch
There is a typographical error: for i=1;100 ↑← HERE Change that to a colon and it works — %I couldnt make array v...

3 years ago | 0

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How do use the annotation function to annotate specific x-values on my graph?
I wrote a couple anonymous functions recently to transform (x,y) coordinates to normalised coordinates for just this purpose. ...

3 years ago | 0

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Can't get symbolic numbers.
The sympref function should work, specifically: sympref('FloatingPointOutput',false); or: sympref('FloatingPointOutput','de...

3 years ago | 1

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Answered
Combining multiple matrices into a single vector
A single vector is not possible, however a 3D array is with the cat function — T1 = [2 3; 4 2]; T2 = [1 7; 9 ...

3 years ago | 0

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Answered
How can I change an entire column of dates into datetime format?
It appears to be UCT (or GMT in 1940). Perhaps this (the 'InputFormat' descriptor must match the format of the string you wan...

3 years ago | 0

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How to stack-up multiple cases in z axis?
clc clear x(1) = 0 ; y(1) = 0 ; zm = NaN(2,200); multiplier = 50 ; figure(1) hold on for i1 = 1:2 multi...

3 years ago | 0

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Answered
How to fill color between two curves?
If you only want the region between the curves before or after they cross, use ‘logical indexing’. Try this — % clc % clea...

3 years ago | 0

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Answered
How to correctly do a Student Test for atmoshperic data
I’m not certain what you’re doing. I would use ttest2 on the filtered and unfiltered events themselves (since that is how ttest...

3 years ago | 0

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Answered
How to edit y-axis scale in pop_spectopo function to log power spectral density 10*log10(uV^2/Hz)
This ‘10*log10(uV^2/Hz)’ is the same a dB/Hz. Thi is the same as the units of the ‘pxx’ outputs of the pwelch and periodogram f...

3 years ago | 0

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Answered
nonlinear regression for multiple variable parameter
Your code works. The only change required was to create the ‘pressure_Keq’ matrix as the independent variable and then change ‘...

3 years ago | 1

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I need help graphing a function.
It probably should be a decaying sinusoid. The problem is that it decays too fast. Decreasing the magnitude of ‘t’ helps to ...

3 years ago | 0

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Answered
Find least frequent value in an array
One approach — H = [1 1 2 2 3 3 4 5 5 5]; [Hu,~,uidx] = unique(H, 'stable'); [Out,idx] = min(accumarray(uidx,(1:numel(uidx))...

3 years ago | 0

Answered
Convert array of numbers to an array of padded strings
Use the compose function — stanums = 7:12; stastrings = compose("%02d", stanums) Note the format descriptor string. .

3 years ago | 0

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How to filter a certain range of values
I am not certain what you mean by ‘filt’ since I do not know if you want to keep those values or exclude them. M1 = readmatr...

3 years ago | 0

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Distance between 2 curves from one point
Using interp1 — % Gegebene Daten x = [29.069, 44.395, 59.528, 74.76, 90.036]; y = [0.07091, 0.076187, 0.081665, 0.087588, 0....

3 years ago | 0

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Graphics from 2D data
It would be nice to have ‘x’ since I suspect that ‘x(:,1)’ cycliically repeats. Using reshape to use the cyclic repeat informat...

3 years ago | 0

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Answered
Bar plot with lower values not fixed
Use the patch function in a loop — x = (1 : 9).'; % Assume Column Vec...

3 years ago | 2

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How to make column vector from existing column vector
Perhaps create a second table. Tzoomed = T(1:1000,:) Then refer to it as you would the original ‘T’ with respect to its var...

3 years ago | 0

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Answered
My graph is not picking up my time increments, its suppose to have a nice curve, but its coming out as a straight line.
Vectorised version — clear Ts=30; % ms Td=60; % ms Chs=.001; % L/mmhg Chd=.015; % L/mmhg N=800; % number of elements t=0...

3 years ago | 1

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How to plot circular phase in planar axis without lines going from ymin to ymax when data goes from -pi to pi?
I am not certain what result you want. The phase plots appear to be radian measure and otherwise relatively continuous, so see ...

3 years ago | 0

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Answered
I'm trying to make a for loop that has if statments that use the increments from my i to run them. How can I make this work, it won't run.
It runs. For equalities such as you are using, use the any function. Try this — Ts=30; % ms Td=60; % ms sc=10^-3; % con...

3 years ago | 1

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Answered
Cannot create .txt file in Matlab online
I am not certain what the problem is. Using fopen only creates the file ID, as you discovewred. To write the file, you need ...

3 years ago | 0

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extract audio features from music
The spectralCentroid function was introduced in R2019a. You need to have that or a later release to be able to use it.

3 years ago | 0

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MATLAB R2023a unusable on brand new desktop computer
Use Windows Task Manager and Resource Monitor to see what else is running and what resources are being used. Also R2023b is c...

3 years ago | 0