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Hello, is there a way to create mxArray from double *?
If by create you mean typecasting, then no. If by create you mean populate then yes: mwSize m = 100, n = 10; //Array size ...

13年以上前 | 0

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How should I alter this sum?
Note the in _mat(1,25-j)_ the index needs to be superior to 0, otherwise an error will be returned. Considering that: nVals...

13年以上前 | 0

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Converting R code into Matlab code
No, they are different languages. You could however try some of the interfaces that are out there. <http://www.omegahat.or...

13年以上前 | 0

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Find value of variable in a equality
This is not really a Matlab question. You could explicitely solve this equation using some arithmetic. That said, you could alw...

13年以上前 | 0

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reading header line from text file
It means the position indicator is not at the beginning of the file after it exits textscan: You can either rewind: fid =...

13年以上前 | 0

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How to 'who' the global workspace to a variable in a function ?
This sounds like a job for <http://www.mathworks.com/matlabcentral/fileexchange/7129 keep4>.

13年以上前 | 0

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reshape with a huge matrix
arrayfun(@(x) {mean(data(x,:),2},index,'uniformoutput',false);

13年以上前 | 0

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index and matrix selection
cell2mat(arrayfun(@(x) {data(x,:)},index,'uniformoutput',false)); Using reshape should be faster though.

13年以上前 | 0

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Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

13年以上前

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

13年以上前

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Sort a list of complex numbers based on far they are from the origin.
Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear f...

13年以上前

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sample vectors with pre-defined angle
I don't think there is. You could always try this: nDim = 5; point1 = randn(nDim,1); point2 = randn(nDim,1); vec = poi...

13年以上前 | 0

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corresponding index of an element
idx = find(g_counter == 0 & list == 0); or idx = find(~g_counter & ~list); or idx = find(g_counter - list == g_c...

13年以上前 | 0

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What are the best practice in mex ?
I don't mean to sound facetious, but poorly written code will generally be slower than well written code, independently of the l...

13年以上前 | 0

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way to use returned valued of a if clause
I assume you mean something like, in C/C++ style if (++i == some_value){ //do something with the new value of i } Th...

13年以上前 | 0

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how to remove the gap between subsequent plots
1. Create custom axes, e.g.: h1 = axes('Position',[0.1 0.1 0.4 0.4]); h2 = axes('Position',[0.1 0.5 0.4 0.4]); h3 = axes...

13年以上前 | 0

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How to know the sequence of file in a large project
doc mfilename You could place that in all your .m files and see which ones get called. You could also look at doc dbsta...

13年以上前 | 0

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Can array values be used in plot titles?
a = 1:10; all_titles = arrayfun(@(x) {num2str(x)},a); h = cell(1,10); for ii = 1:10; h(ii) = {subplot(1,10,ii)}; ...

13年以上前 | 0

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Test randomness from STD deviation
No, the standard deviation by itself will tell you next to nothing about the nature of the distribution. Something like the two-...

13年以上前 | 0

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How can I properly export a figure using the 'patch' command?
Looks like your image is transformed to a bitmap. When you use patch, the renderer might be set to *OpenGL* by default. Try and ...

13年以上前 | 0

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Complex Variables and Memory mapping
Yes, but you would need to use the C/C++ or FORTRAN <http://www.mathworks.se/help/matlab/apiref/_bqoqnz0.html api>. It provides ...

13年以上前 | 1

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read a text file or not read it
idx = 1:100; idx([50 69]) = []; %You could also use an if statement inside the loop, but this might be more efficient fo...

13年以上前 | 0

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Plotting in four data sets in quadrants of a single graph
I am not sure I understand what you mean. Subplot sounds like the solution for this problem. If by a single graph you mean you...

13年以上前 | 0

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save a data as mat file
I would recommend putting everything in a cell array, that you can then save. all_data = cell(10,1); for ii = 1:10 ...

13年以上前 | 0

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Matlab built in functions
Hard to say. You would need to ask the Mathworks to show you their source code. I am rather sure they would be somewhat reluctan...

13年以上前 | 0

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JUST Take integer value number from decimal value
a = -3.1145 your_val = fix(a) If you also want it to work for negative numbers.

13年以上前 | 2

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Fully standalone executable file
You need to have Matlab runtime installed in the computer where you plan to run your project. Otherwise it will not work. You do...

13年以上前 | 1

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Colors in Polar Plots dissapearing when Scaling colorbar
Please read the documentation doc caxis From the description of your problem I would guess that the values in PhC are eit...

13年以上前 | 0

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How to make a reference to multiple subelements of a cell without for loop (to create a plot)
your_vals = cellfun(@(x) x(end),your_cell)

13年以上前 | 0

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Collecting all the data after running an M-file multiple times
Make your m-file a function and return the values you want to save. Look at doc function Quick example: function...

13年以上前 | 0

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