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lsqcurvefit initial point is always a local minimum, relative first-order optimality is always = 0
I think you have a typo here: F = @(v,cur_data_wave_x) amplitude*(offset + cos(v0(1)*(cur_data_wave_x) + v0(2))); should rathe...

6年弱前 | 0

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Applying a for loop to every column in a vector
Agree with KSSV, avoid naming as "max", but in this case it is not causing your problem. Your problem is that "index" should no...

6年弱前 | 0

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How to choose 5 random rows from an array of 8 rows for 10 times and save the 10 results
if order doesn't matter (6,4,8,7,2 is the same as 4,6,8,7,2) doc nchoosek if order does matter (6,4,8,7,2 is different from 4,...

6年弱前 | 1

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solving a second spatial derivative using ode45
This comment is incorrect: % Create a two element vector that holds the derivative equations of u and % v % U(1) is u and U(2...

約6年前 | 0

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How to save file on chosen path in app designer?
can you just simplify and use uiputfile()?

約6年前 | 0

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Implicit Boundary Value Problem
Ok, so looks like what you are after is solving a DAE that has BCs at more than one boundary. Docs say it is ode15s and ode23t ...

約6年前 | 0

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Select mxm matrix from mxn matrix and solve systems of linear equations
Does this help with first problem: https://www.mathworks.com/help/matlab/ref/nchoosek.html Second problem, maybe make tolerance...

約6年前 | 1

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Reduce time execution in a real time serial data reading
If instead of a loop, you use a timer (https://www.mathworks.com/help/matlab/matlab_prog/use-a-matlab-timer-object.html), you mi...

約6年前 | 0

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how to generate text file from generated output
fprintf() accepts as 1st argument a file identifier for a file opened with fopen(). fid = fopen("somefile","w") fprintf(fid,...

約6年前 | 0

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App designer: Enable mouse scroll to change value on slider
Take a look at the UIFigure's following properties: WindowScrollWheelFcn WindowKeyPressFcn WindowKeyReleasedFcn If you need ...

約6年前 | 0

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Trying to identify directions of overlapping lines in images, at my wit's end
Have you looked into radon transforms? You might get some "signal" at the 45 and 135 directions for the right image... If these...

約6年前 | 1

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Comparing terms in a character array
If it is truly a "character array" and you want exact matches only, you can use the findstr() command, which will return empty i...

約6年前 | 0

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Web app system command
To the question: Also, an other question just came to my mind: what's the best practice to store permanent data and access them...

約6年前 | 0

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Getting data from the figure in appdesigner
Here's an example where I used the data cursor's update function itself to collect the coordinates and feed directly into your a...

約6年前 | 2

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reshaping multi dimensional array and central difference method
Based on your example lines, you seem to have the further simplification that your delta x and delta y are uniform (in your exam...

約6年前 | 1

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Filter a table based on date (Error using tabular/dotParenReference (line 95) Unrecognized row name '01/00/0000'.)
The second way is almost right, but when you use () on testtable, you are extracting a subtable, rather than the datetime array ...

約6年前 | 1

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Using a image variable from one GUI function to another in AppDesigner
Create a property for your app class to hold the image. You appear to be using appdsigner. In appdesigner's code view, on the l...

約6年前 | 1

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Plot a curve with its derivatives
As far as I know, matlab's plot function will draw a straight line (linear interpolation) between adjacent points. For your cas...

約6年前 | 0

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Generate matrix of precise length and in ascending order
This seems to work, and is less wasteful RowSum = 10; NCols = 4; NRows = 70000; A = randi(floor((RowSum-2)/(NCols-2)),[NRo...

約6年前 | 0

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How do i create a multi-colour histogram using excel data?
I suspect your yA, yB, yC are column vectors, which you are trying to horizontally concatenate with scalars. You can probably fi...

約6年前 | 0

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How plot a figure like this attached figure?
It's because mesh expects z-data to be actual coordinates in z, but mesh (and surf) will accept a 4th argument for color N = 50...

約6年前 | 0

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Using trapz doesn't work
F is of size 1x1, not 1x24000

約6年前 | 0

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Painters renderer results in jagged edges
What happens if you set "FaceColor" to "interp" (default is "flat") on the surf object? It fixes the jagge edge for me (2017a or...

約6年前 | 1

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Solve system of boundary value problem (a singular Jacobian encountered)
If you know the problem is solvable (HW, e.g.,), then singular Jacobian usually means something is wrong with your equations or ...

約6年前 | 0

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determining order of accuracy
This is not a matlab question but a numerical analysis problem. Since someone already generated the results for you, it's a matt...

約6年前 | 0

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Branching a WindowButtonDown function
If you don't mind using undocumented features, I have had success using the standard axes() object instead of uiaxes(), because ...

約6年前 | 0

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Proper reading of .txt
Just use readtable()? Looks like every station will have already-aggregated results (hourly vs daily for the same station, same ...

約6年前 | 0

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ODE solver: how to integrate a system with a vector of parameters?
Are you just looking for solving the ODE as many times as you have different values of V? t = [0 400]; y = [0.004 0 0]; alpha...

約6年前 | 0

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Limiting mouseclick event to current Axes in App Designer
Cameron's idea of calculating the axes position within the figure position should work, and it is the only way with currently do...

約6年前 | 0

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How to access left bottom pixel in image using (0,0)?
If you just want to translate the unflipped image's row index to be translated into a different index as if you were indexing th...

約6年前 | 0