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Joel Lynch


Last seen: 3日 前 2021 以来アクティブ

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質問


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...

約2ヶ月 前 | 1 件の回答 | 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...

6ヶ月 前 | 0

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質問


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...

6ヶ月 前 | 1 件の回答 | 0

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質問


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...

10ヶ月 前 | 1 件の回答 | 0

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チャネル


mychannel
test

11ヶ月 前

質問


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...

約1年 前 | 1 件の回答 | 0

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質問


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...

約1年 前 | 1 件の回答 | 0

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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...

1年以上 前 | 0

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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...

1年以上 前 | 0

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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...

1年以上 前 | 0

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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 ...

1年以上 前 | 0

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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...

1年以上 前 | 1

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

1年以上 前 | ダウンロード 29 件 |

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

1年以上 前 | 0

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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...

1年以上 前 | 0

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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...

1年以上 前 | 1

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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...

1年以上 前 | 0

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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 ...

1年以上 前 | 0

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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...

1年以上 前 | 0

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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...

1年以上 前 | 0

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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...

1年以上 前 | 0

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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 = ...

1年以上 前 | 1

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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...

1年以上 前 | 0

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

1年以上 前 | 0

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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...

1年以上 前 | 0

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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....

1年以上 前 | 0

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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; ...

1年以上 前 | 0

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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...

1年以上 前 | 1

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Heat diffusion problem. Why my program is showing error when I am trying to change 'nx' value i.e. no of rows beyond 13 ? Is there any problem with time or timesteps??
It looks like you are not including the dt value in your stencil. You also need to be mindful of stability when setting the time...

1年以上 前 | 1

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mat-op-ex
Matrix Operator Extraction Toolkit - Tools to obtain the matrix form of common MATLAB linear operations (e.g. trapz, interp) for...

1年以上 前 | ダウンロード 1 件 |

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