Answered
Newton-Raphson Method with Jacobian
In Newton loops you must evaluate your f and j and currently guessed iterate, so your line h = -f(x0(1),x0(2),x0(3))*j(x0(1),x0...

4 years ago | 0

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Answered
Solving Linear Differential Equations for Path Following ; I am getting difficulties in implementing the coding with variable psi_e, let's say if I want to run it for psi_e going from 0 to pi/2, how can it be done?
To change value of psi_e (make it variable) seems straightforward: make psi_e an input in your odefun, then loop over psi_e: f...

4 years ago | 0

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how to use tensors
this is a bit imprecise, but if you mean "order 2 tensor", it can be represented as a 2D matrix. Order 3 tensor is then 3D matri...

4 years ago | 0

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ode45 error rungg- kutta
your error is probably not with the ODE line, but actually running "Simulation", which you are not supplying any arguments to at...

4 years ago | 0

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Solving second order PDE
Does this help: https://www.mathworks.com/help/matlab/ref/pdepe.html I believe that pdepe is available with base matlab. It ap...

4 years ago | 0

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Saving multiple outputs from ODE45 with different dimensions?
I would use cells...also what's with the dual indexing? options can be defined outside since nothing is changing from iteration ...

4 years ago | 0

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Increment a class property everytime calling a class method
subclass from the handle class (default is value class), and you can update properties of the instance without explicitly overwr...

4 years ago | 1

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Answered
How to plot values with different color with "if statement"
look at the documentation for the "scatter()" command. can you do what you want with that?

4 years ago | 0

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App inside app question
If not more than 1 image needs to be displayed at once, maybe just save all the image data internally, have only one axes, and h...

4 years ago | 1

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Answered
Selection of data in timetable
Hmm, so the question is about periodic time ranges...there might be a better way, but maybe you can use "isbetween" on an auxili...

4 years ago | 0

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How can i select cell from table in app designer?
The UITable has a callback for selection https://www.mathworks.com/help/matlab/ref/matlab.ui.control.tableappd-properties.html#...

4 years ago | 0

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Reading data from ASCII file
It would have been helpful to know these things in advance (you hinted at the first, but say it explicitly) Data contains multi...

4 years ago | 0

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Surface Fit over image
Here's my first pass thoughts: First steps: Obtain X and Y coordinates of your pixels ensure your pixel values are of type do...

4 years ago | 1

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Question

How to identify ui component classes that other ui components can be children of
I am trying to identify ui components like uipanels, uigridlayouts, uitabs, etc., that may contain other ui components as childr...

4 years ago | 1 answer | 0

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answer

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Plotting points in 3D with mesh
For just visualizing the chosen data in a surface, does this look like what you want? clc; close all; clear; N = 500; X...

4 years ago | 0

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Answered
How can I solve a partial derivative equation if it does not contain a time derivative in MATLAB?
If you mean by "no time variable" that your equation is elliptic in more than 1 independent variable, then unfortunately you'll ...

4 years ago | 0

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Answered
[App Designer] Get the object indentifier that triggered the callback
I think a cleaner way is to pass an identifier with the callback definition: ASpinner.ValueChangedFcn = @(evnt)app.VChanged(evn...

4 years ago | 0

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Plotting a graphic output of an external function in APPDESIGNER, more specifically the uiaxes
If there is no way to activate a uiaxes programmatically, you can try to create a regular axes in app designer in the startupfcn...

4 years ago | 0

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Roots of a two variables equation involving a numerical integration
Assuming x and y are scalars and there is a solution, use fsolve, not an optimization algorithm. You'll need initial guesses. Th...

4 years ago | 1

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Accessing an element of an array using an array as its index.
Interesting...I guess your question title should be edited to "use array as subscripts into multidimensional array". I dug into ...

4 years ago | 0

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Answered
Struct to numeric variable
At the risk of having misunderstood: new_var = [structname.fieldname] This would work if you structname is a structure array 4...

4 years ago | 0

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How can I specify the way components resize automatically in App Designer?
"uigridlayout" was introduced in 2018b, which may be helpful...It allows pretty sophisticated layouts, although it still seems b...

4 years ago | 2

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How to add the value of the 3 highest elements automatically from a vector?
like this? [~,idx] = maxk(y,3) y(idx) = y(idx) + sx Are x1 and x2 irrelevant to your question?

4 years ago | 0

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How to map a vector to a colourmap ?
A brute force way would be to interpolate...not sure if there's a better way x = % ... data vector indices = 0:255; xref = ...

4 years ago | 1

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Making a square figure with pcolor
Your coordinate grid matrices x and y are not "aligned" with the axes. You can see this if you just do plot3(x,y,zeros(size(x)...

4 years ago | 0

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Getting Cell location of checkboxes on selection (UITable)
Is it as simple as defining a CellEditCallback?

4 years ago | 0

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Answered
Is there an automatic way to find the centre of this circularly-symmetric pattern?
This would be not at all efficient and maybe not robust, but you could pose a minimization problem: Find the coordinates (Xc,Yc...

4 years ago | 0

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How can I create binEdges?
It looks like your problem is not with binning, but the fact that you have NaN's in your data. By the way if you have 2014b or ...

4 years ago | 0

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Answered
Extracting particular x and y data points from a figure
Thinking in terms of graphs is useful but only takes you so far. The point is how to think about the data and/or functions under...

4 years ago | 0

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Help in implementing ode45 in app designer
Static methods don't assume that the app is passed as the first argument, so remove "app" from the arg list methods (Static) ...

4 years ago | 0