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Andy


Last seen: ungefär en månad 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...

ungefär en månad ago | 1 answer | 0

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answer

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...

ungefär 2 månader 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...

ungefär 2 månader ago | 1 answer | 0

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answer

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 månader 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 månader 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 månader ago | 1 answer | 0

1

answer

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 månader 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 månader ago | 1 answer | 0

1

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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 månader 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 månader ago | 1 answer | 0

1

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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 månader ago | 1 answer | 0

1

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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 månader 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 månader ago | 1 answer | 0

1

answer

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 månader ago | 1 answer | 0

1

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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 månader ago | 1 answer | 0

1

answer

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 ...

mer än ett år 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...

nästan 2 år ago | 1 answer | 0

1

answer

Question


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

ungefär 2 år ago | 0 answers | 0

0

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 ...

ungefär 4 år ago | 0 answers | 0

0

answers

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 ...

mer än 4 år 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...

mer än 4 år 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. ...

mer än 4 år ago | 1 answer | 0

1

answer

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...

mer än 4 år ago | 1 answer | 0

1

answer

Question


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

mer än 4 år ago | 1 answer | 0

1

answer

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...

ungefär 5 år ago | 1 answer | 0

1

answer

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

ungefär 5 år 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...

mer än 5 år 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...

mer än 5 år ago | 0 answers | 0

0

answers

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...

ungefär 6 år 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...

mer än 6 år ago | 0

| accepted

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