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James Lebak

Last seen: 8日 前 |  2012 年からアクティブ

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  • Knowledgeable Level 3
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  • 3 Month Streak
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Why do I receive a warning about a value indexed with no subscripts?
This warning was removed in R2023a. More details are in the release notes.

9ヶ月 前 | 0

回答済み
Unexpected slowdown using () indexing
Paren-reference in many cases creates a copy. This is expected behavior. NULL(1) is nearly as fast as NULL on a scalar because...

2年弱 前 | 3

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Overloading subsref and calling the builtin from within causes the class to only return the first value when called on a nested vector of objects.
To get the behavior you want, your class needs to overload numArgumentsFromSubscript. One example implementation of this method ...

約2年 前 | 0

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Can I use Matlab's default implementation of empty with matlab.mixin.indexing.RedefinesParen?
You do have to provide an 'empty' for your class that inherits from RedefinesParen. Such classes are scalars masquerading as arr...

2年以上 前 | 0

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Is it a good idea to overload subsref to mimic MATLAB's griddedInterpolant behavior?
Subsref is the way that griddedInterpolant does this. Another way is to inherit from matlab.mixin.indexing.RedefinesParen, or fr...

3年弱 前 | 1

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How to overload a single parentheses indexing operation, not all of them?
I would not do this by overloading indexing. As you point out, overloading indexing is difficult, and as Walter points out you s...

3年弱 前 | 0

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Wrong varargin when calling memoized functions saved in a handle class as constant properties
This is a bug. I see this behavior in R2020b and earlier, but not in R2021a or R2021b. If you can try either of those more recen...

約3年 前 | 0

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Matlab 2021b quit when starting Simulink
Looking at the stack, it might be Bug Number2599486: Crash with CreateSharedDataCopy on top of the stack.

約3年 前 | 1

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Overriding subsref and subsasgn - effect on private properties
Beginning in MATLAB R2021b it is possible to overload parentheses, dot, and brace indexing independently. This gives the ability...

約3年 前 | 1

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How can I avoid this error when creating a MEX file? "Error: Link of 'mexGPUexample.mex64' failed."
Hi Edward, You stated you were using CUDA 5.5 and VS 2012. When you build MEX files for the GPU, you must use the same versio...

11年弱 前 | 3

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gpuDevice command very slow
MATLAB R2012a doesn't include code for the Kepler series GPUs. This means that the very first time you call any GPU command afte...

11年以上 前 | 3

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BLAS or LAPACK in CUDA kernel
You're correct that you can't call DGETRS and SGETRS directly, as that's CPU-side code. The CUDA 5 version of CUBLAS has a batch...

11年以上 前 | 0

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making the cuda volume renderer included in the sdk work with matlab
Yes, you can use these in a GPU MEX file in R2013a. You will have to compile the MEX file for the GPU as detailed in the <http:/...

11年以上 前 | 2

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"MATLAB was unable to initialize the GPU FFT library" ??
You are correct that the symptoms you mention indicate a memory problem. The GPU FFT requires memory not only for the input and ...

11年以上 前 | 0

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IFFT slow down with using gpuArray
The GeForce GT630M is a mobile graphics card. Frequently, these cards don't perform as well in double-precision as they do in si...

11年以上 前 | 1

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mex CUDA code to calculate Coulomb field
Mike, I'm glad to hear that you're using the GPU MEX API. Below are my answers to your questions, which you can accept or re...

11年以上 前 | 0

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two - loop with GPU
Yes, 1:gpuArray(N) for scalar N doesn't work in MATLAB R2013a. Try the following: x=gpuArray.colon(1,N)*ds-L/2; y=gpuArr...

11年以上 前 | 0

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Help Choosing a GPU?
Obviously, it's going to depend on your problem, but the amount of memory on the card is a very important consideration. Estimat...

11年以上 前 | 0

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Using multiple GPUs in a parfor type of loop
In R2012b and later, in a matlabpool on a single machine with two GPUs, each worker will use a different GPU by default. You can...

11年以上 前 | 1

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gather takes really long after using ptx file /CUDA
In MATLAB R2012a and later, GPU functions execute asynchronously in MATLAB. To get accurate timings, you need to call the wait f...

12年弱 前 | 1

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MATLAB Parallel Computing Toolbox + (2) NVIDIA GeForce GTX 690's in SLI
As far as I can tell, this is not possible, because SLI and CUDA don't interact. The CUDA C Programming Guide makes little menti...

12年弱 前 | 0

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What is the best way to determine if a usable GPU is available?
Hi Joe, There is not presently a function called 'canUseGPU' in Parallel Computing Toolbox. Matt's answer will work. You coul...

約12年 前 | 2

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Allocate page locked memory for output array in mex?
Justin, Unfortunately this isn't possible in MATLAB today. The function mxCreateDoubleMatrix returns an mxArray, not a raw po...

12年以上 前 | 0

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