Joel Lynch

Last seen: 5 meses hace | Con actividad desde 2021

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Pregunta

Inconsistent results for symbolic integration of >2 cosine factors
When I integrate the product of two cosine functions with integer arguments, I get an answer that appears correct. When I add a ...

alrededor de 1 año hace | 0 respuestas | 0

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Pregunta

Can the default behavior of selected annotations be changed to avoid unwanted movement?
A common occurence in Figure manipulation is selecting an object (e.g. arrow, textbox, etc) for editting in the property inspect...

casi 2 años hace | 0 respuestas | 0

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Without resorting to FEX/MEX, can the overhead of repeated calls to sparse() be avoided with operations on I, J, V directly?
I have a time-marching problem bottlenecked by matrix multiplication , where the sparse matrix is the sum of many time-independ...

más de 2 años hace | 1 respuesta | 0

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fmincon/multistart won't debug/display errors in OutputFcn
I figured out the issue, 'OutputFcn' must be added in Multistart, not fmincon. This also means using different syntax for the ca...

casi 3 años hace | 0

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Pregunta

fmincon/multistart won't debug/display errors in OutputFcn
If "x=b" is uncommented, the code still runs and does not break on error or display the line number. This means debugging a mor...

casi 3 años hace | 1 respuesta | 0

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Pregunta

Is there a better way to initialize the DataTipTemplate field in primitive objects?
Problem: Creating a Chart Object as in Plot() initializes a DataTipTemplate field in the resulting handle. p = plot(0,0); p...

más de 3 años hace | 1 respuesta | 1

1

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mychannel
test

más de 3 años hace

Pregunta

Why do logical indices implicitly reshape? Is there a workaround?
I've encountered this several times, and it always bothers me. Say for example I want to sum each row of matrix A, for values le...

más de 3 años hace | 1 respuesta | 0

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Pregunta

When using "Pause on Warning/Error," is there a way to avoid breaking into built-in functions?
For example, a bad set of data when calling "fit" breaks into a function called "curvefit.attention/Warning/throw": Warning: Eq...

más de 3 años hace | 1 respuesta | 1

1

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Respondida
Box Plots for Vectors of Varying Length
The proximate error is that the symbols around the year-range string ‘1931-1960’ are not apostrophes, so MATLAB doesn't know w...

más de 3 años hace | 0

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Respondida
Mesh Grid of a 3d array
So this may be due to confusion about how mesh() works. Mesh produces a 2D surface in a 3D volume, with the Z-axis being the val...

más de 3 años hace | 0

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Respondida
Run "if" logic on a row
The trick is to recognize that you can use & / | (and/or) to chain multiple logical operations together. In this case, you can g...

más de 3 años hace | 0

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Respondida
Solve the generalized form of the Poisson equation
I don't get an error when running your code with MATLAB version 2019b, but the bigger problem you have is that your method will ...

más de 3 años hace | 0

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Respondida
How to plot a matrix within a matrix?
In terms of organizing the data, the simplest approach is to create two matricies for stiffness and deflection that have two dim...

más de 3 años hace | 1

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Enviada

ternary_plots
MATLAB package for creating ternary plots. Based loosely on 7210-ternary-plots by Ulrich Theune.

casi 4 años hace | 28 descargas |

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Respondida
set xticks by calculation but also force 0 to be displayed
set(gca,’XTick’,array_of_values)

casi 4 años hace | 0

Respondida
Function for telling if a function is unique and how many solutions it has.
".p" files are purposefully obfuscated, so you cannot copy the code, suggesting your instructor does not want you to use someone...

casi 4 años hace | 0

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Respondida
Why do I get 'Out of Memory' error?
Out of memory is exactly what it sounds like: your program is trying to hold more data on system memory than is available. The c...

casi 4 años hace | 1

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Respondida
I need help with creating bounded logarithmic plot
Assuming you meant to have , then t = linspace(0,2*pi); x = exp(-t); % if constant, then x(1:numel(t))=exp(-1); y = t; plo...

casi 4 años hace | 0

Respondida
How to find the zero crossing in x and time data sets?
idx = find( f(2:end).*f(1:end-1)<0 ) Will return the left-hand indicies of cross-over points. To get the exact X-values where ...

casi 4 años hace | 0

Respondida
how to form a two-column array for a given but dimmension-unknown array?
You can make a row vector of any N dimensional matrix by linearizing, for example A( 1:numel(A), 1 ) = A(:); .Thus, you can a...

casi 4 años hace | 0

Respondida
Conditional Scatter plotting based on third data set
Assuming columns with 1's will only have 1's, and columns with 2's and 3's will never have 1's, then it is as simple as taking t...

casi 4 años hace | 0

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Respondida
How to take 1 row on table 1 and compute it against every row of table 2 and do this for each row in table 1
Assuming the data is read into two variables, d1(1:N1,1:3) and d2(1:N2,1:3) by d1 = xlsread('Matlab Help.xlsx','Random','B2:D31...

casi 4 años hace | 0

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Respondida
Using trapz just for positive areas
You need to use more fine-grid X data in polyval to get test points at y=0. xA_fine = linspace(xA(1),xA(end),100); fA_fine = ...

casi 4 años hace | 1

Respondida
Continue after .exe finishes
You can use system() function to pass the command (as a string) without the "!" symbol. If using unix OS, you can pipe (with the...

casi 4 años hace | 0

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Respondida
stacked plot x axis change in 2015 matlab version
bar(Y(:,1),Y(:,2:end))

casi 4 años hace | 0

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Respondida
Find the input values of a function within an output range.
If you cannot solve algebraically (no closed form solution), then fzero is the best bet. Something like this: % example y range...

casi 4 años hace | 1

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Respondida
how to fix this error 'Index in position 2 exceeds array bounds.'?
The proximate reason for the error is that "Popbest" is empty, and so acessing the first column by Popbest(:,1) throws an error....

casi 4 años hace | 0

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Respondida
How to show two axis on a plot only where i want them
You can get the handles for the left and right axes with yyaxis. yyaxis left; % Sets the current y-axis left left_ax = gca; ...

casi 4 años hace | 0

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Respondida
How can I plot the maximum values of the double matrix ?
Max() has an optional third argument that determines the index along which to take the maximum. So for a 10x20 matrix A, A_max...

casi 4 años hace | 1

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