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Andy


Last seen: 2 months ago |  Active since 2017

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MATLABEngine.ConnectMATLAB() executed twice: first time it works, subsequent times - won't work, until you restart the program
Setup is windows 11 x64, latest updates, latest Visual Studio Community Edition, etc. Below behavior reflects in .NET Help Cent...

2 months ago | 1 answer | 0

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Question


MATLAB Function to .NET Application Using MATLAB Data API for .NET with complex data structures (OrderedDictionary<DateTime, double[]> <=> timetables)
How would the below example: https://uk.mathworks.com/help/compiler_sdk/dotnet/deploy-mlcode-in-dotnetapp-using-ml-data-api-for...

2 months ago | 1 answer | 0

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Question


System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B), Source=MathWorks.MATLAB.Types
Reproduce: Within a Visual Studio Windows Console app, add references to: C:\Program Files\MATLAB\R2024b\extern\dotnet\netstan...

2 months ago | 1 answer | 0

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Answered
backtestStrategy: rebalance function keeps track of past & current open position
best way to do that currently is to use the engineDataList and within the rebalancing function, compute: positions = engineData...

7 months ago | 0

| accepted

Question


COM - Feval() passing a table as a Double[,] is as expected, nonetheless c# Dictionary.ToArray() returns a Double[][] (what is called a jagged array)
What would a best practice be in passing a Dictionary like structure into a matlab function such as "cov" using COM's Feval() .....

7 months ago | 1 answer | 0

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Question


COM: matlabObj.Feval() - works for calling one function, how would it work for calling a nested set of functions?
Take this c# / .NET example of calling a Feval on "cov" for variable t2, which works great: > t2.GetType() [System.Double[,]] ...

7 months ago | 1 answer | 0

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Answered
Invalid Callee when using Matlab as a COM server
Yeah, interesting @Janis Stolzenwald! Stumbled across the same problem ... thanks for sharing your solution 7 years later! Did ...

7 months ago | 0

Question


backtestEngine / runBacktest speed of execution / parallelisation
Hi Experts, Do we know whether runBacktest (part of backtestEngine) does any parallel execution ... on timatables having daily ...

7 months ago | 1 answer | 0

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Question


timerange subscript within a timetable
End goal: timeTableTT14to22 = timeTableTT(hours(14) <= timeofday(timeTableTT.Date) & timeofday(timeTableTT.Date) <= hours(22), ...

7 months ago | 1 answer | 0

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Question


using a MATLABEngine obj to dynamically construct a timetable with dates "yyyy-MM-dd" as keys and multiple double value columns
Hi Experts, 1) Looking for a best practice/way to dynamically build a timetable (through a for loop that would add multiple lin...

8 months ago | 1 answer | 0

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Question


NuGet - mathworks.prodserver.dotnetclient library
Hi All, Curious to understand if any of you are using: https://www.nuget.org/packages/mathworks.prodserver.dotnetclient/2023....

8 months ago | 1 answer | 0

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Question


backtestStrategy: rebalance function keeps track of past & current open position
Hi All, backtestStrategy provides a great workflow for defining a strategy, which includes the rebalancing function. As part ...

8 months ago | 2 answers | 0

2

answers

Question


call Matlab code from c# / .NET threads: multi-thread scalability: is MathWorks.MATLAB.Engine best option?
Hi Experts, Typically NET & Matlab synergies is a common topic of interest. Having said that, just simply calling a function h...

9 months ago | 1 answer | 0

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Question


excel-like formula column
matrix of two columns representing in the morning and in the day. can we have a 3rd column that would compute the average of f...

11 months ago | 1 answer | 0

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Question


Index a Y = MxN, with X=Mx5 (where elements in X are column IDs for values to extract from Y)
Having a Y = MxN matrix of data, and a X = Mx5 (or other fixed nr. < than N) matrix obtained as: [~, X] = maxk(Z,5,2); % where ...

12 months ago | 1 answer | 0

1

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Answered
riskfolio-lib / PyPortfolioOpt like functionality
thanks @Steven Lord! Let's get deeper into it then: Riskfolio-lib: https://riskfolio-lib.readthedocs.io/en/latest/index.html ...

2 years ago | 0

Question


riskfolio-lib / PyPortfolioOpt like functionality
Hi All, Is there any functionality equivalent to python's riskfolio-lib/PyPortfolioOpt libraries, or what's the closest? than...

2 years ago | 1 answer | 0

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Question


work with dxFeed data feed?
It would be great if someone presents an example of working with dxFeed datafeed.

2 years ago | 0 answers | 0

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answers

Question


rowfun (or other function?) to access multiple rows in a table (as in current + previous 5 rows)
Following the excel typical example, where a new column can be a formula accessing current row + values in row(s) above / below ...

4 years ago | 0 answers | 0

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Answered
Error in ibtws connecting (Trading Toolbox)
Guys, one question ... Why do you still have Interactive Brokers as a supported broker and data source in the DOCs ... if it ...

4 years ago | 0

Answered
How to fix a simple callback function with a tcpip object?
Should we specify a function: function dispcallback(obj,event) callbackTime = datestr(datenum(event.Data.AbsTime)); f...

4 years ago | 0

Question


can a struct function access struct elements ?
myStruct.va1 = 1 myStruct.val2 = 2 myStruct.mySum = @(x,y) x + y nonetheless, x & y are specific inputs into the function. ...

4 years ago | 1 answer | 0

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Question


dynamic java path vs static java path
So, docs say one can add file javaclasspath.txt under the 'prefdir' folder, and its contents are loaded statically upon Matlab's...

4 years ago | 1 answer | 0

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Question


declare global var by string name
within a function: function DoSomeWork(globalVarName, var2, var3, etc) global globalvarName ??? // so something with gl...

4 years ago | 1 answer | 0

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Question


converting a table (having as first col a datetime col) col into a datetime (having both date & time in its composition)
Oftentimes a datetable has 2 adjacent columns: a datetime with a date and a string with a time. If one wants to concatenate the...

5 years ago | 1 answer | 0

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Question


state machine programming - helper tools
Hi, Are there any predefined classes/objects/functions/docs to make state machines in matlab easier to develop? thanks

5 years ago | 1 answer | 0

1

answer

Answered
Field List of IQFeed Realtime Data
Matlab doesn't have a robust IQFeed library ... multiple cases opened, with a couple of conclusions: 1) IQFeed might sporadic...

5 years ago | 0

Question


programming generic state machines (that would handle a custom data science App): regular .m code vs Simulink / Stateflow?
Usually, one would use Simulink/Stateflow for HDL/Bio/Automotive/Embedded-FPGA/C++/etc. scope ... which a highly focused applic...

5 years ago | 0 answers | 0

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Question


can I increase maximum possible array used memory?
I get: >> memory Maximum possible array: 6209 MB (6.510e+09 bytes) * Memory available for all arrays: 6...

6 years ago | 1 answer | 0

1

answer

Answered
nchoosek with range of k values and ordered sequential value sets
A modified version of an nchoosek sub-function might do the trick: function P = combsCont(v,m) %COMBS All possible comb...

6 years ago | 0

| accepted

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