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Kevin Johnson


Last seen: 6 månader ago |  Active since 2018

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Final few iterations of a parfor loop slow down by a factor of 10
I have a regular for loop which calls a function 44 times. Each iteration takes about 32 seconds to execute in this ordinary fo...

6 månader ago | 0 answers | 0

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answers

Question


What is the most cost effective way for an individual researcher to purchase fast compute for deep learning tasks?
I program in MATLAB and want to substantially increase the computing speed for deep neural network projects. I am talking about...

9 månader ago | 1 answer | 0

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answer

Question


Using with trainbr with narxnet: the predicted value at time t seems to depend in part on the target value at time t. But we don't know that value yet!
Assume we have a time series several thousand points long where we know all of the inputs up to day t, and all of the correct ...

9 månader ago | 1 answer | 0

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answer

Question


Most practical way to speed up calculations?
How much faster is the second scenario compared to the first?: 2015 15" MacBook Pro, 2.2 GHz Quad-Core Intel Core i7, 16 GB 160...

nästan 2 år ago | 1 answer | 0

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answer

Question


Why can future values affect NARX time series output?
I am using A NARX network with one target vector and several input vectors. I am trying to predict the target value each day b...

nästan 2 år ago | 1 answer | 0

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Question


NARX: Outputs are known today, target is not, I want to get estimated target value put in today position. Do I use the one step ahead method? Or the "default" method?
% This is a basic question,but I have managed to confuse myself. I have already searched for prior answers unsuccessfully, an...

nästan 2 år ago | 1 answer | 0

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answer

Question


Can the attempted addition of a new column to a timetable be intentionally prevented?
Can the attempted addition of a new column to a timetable be intentionally prevented? After I build a table using particular v...

nästan 2 år ago | 1 answer | 0

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Answered
How do I extract the ith string from a structure that contains i=1:n strings?
OK, that answers my question. I was putting the index in the wrong place, after the x rather than after the A. Thanks

mer än 2 år ago | 0

| accepted

Question


How do I extract the ith string from a structure that contains i=1:n strings?
I have a structure A.x which contains multiple short strings. (Each string is a date, i.e. '2013-05-15'). If I query as follow...

mer än 2 år ago | 1 answer | 0

1

answer

Question


how to select an interval of certain hours each day within a larger timetable using timerange
Hi, I have a timetable of minute by minute data running over multiple days. I wish to identify the times outside regular busines...

mer än 2 år ago | 2 answers | 0

2

answers

Question


how to shift datetime to account for daylight savings time
The source data I am using expresses times in Coordinated Universal Time (UTC). I need to derive a MATLAB datetime array shifted...

mer än 2 år ago | 1 answer | 0

1

answer

Question


I cannot get closed loop network to run.
%first, I prepare the open network in the usual way net=narxnet(inputDelays,feedbackDelays,hiddenLayerSize,'open',trainFcn);...

nästan 3 år ago | 0 answers | 0

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answers

Question


I cannot upload a question
my questions are ot being uploaded

nästan 3 år ago | 0 answers | 0

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Question


System Identification impulseset function: how do I avoid using deprecated features?
To use impulseest to model a system, I run the following: sstrain=iddata(target_train,inputs_train); Imp = impulseest(sstrain,...

mer än 3 år ago | 1 answer | 0

1

answer

Answered
Regression Learner App does not recognize array or table as valid input, "Start session" button remains grayed out
R2019a update 9 (.6.0.1472908) on a 2015 Mac PowerBook running Mojave 10.14.6 The problem is intermittent. I got it to work on ...

mer än 3 år ago | 0

Question


Regression Learner App does not recognize array or table as valid input, "Start session" button remains grayed out
I have an array of numbers with the first 6 columns representing inputs and the last column representing the target. A few NaNs ...

mer än 3 år ago | 2 answers | 0

2

answers

Question


How to disable dynamic menu items from axes
This question is difficult to look up the answer to because I don't know the name of this visual feature of an axes. It pops up ...

mer än 3 år ago | 1 answer | 0

1

answer

Question


How to converting string values in a cell array to numbers when some strings are non-numeric (e.g. 'null')
I have a cell array like this: T = {'0.115513'} {'0.113281'} {'0.112723'} {'null' } {'0.110491'} ...

mer än 3 år ago | 1 answer | 0

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answer

Question


How alignment of data is treated by the neural network algorithms for one day ahead prediction
I am having trouble understanding how the alignment of data is treated by the neural network algorithms for one day ahead predic...

mer än 6 år ago | 1 answer | 0

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