How to collect a new variable each time a function runs and save it into an array
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Allan Munro
il 30 Nov 2020
Commentato: Allan Munro
il 3 Dic 2020
Hi, I have a program that is collecting a variable each time it is run through the function (every minute) and it collects a variable called 'VWAP'.
How do I save this data so next time the function runs it will save the new value of the variable in an array so all the values can saved for analysis later?
I was looking at mlock, but I am not sure how to use that to build an array.
Any assistance even directional is appreciated. thanks
Allan
function processContracts(contracts, params)
datavwap = IQML('quotes','Symbol','ACB','Fields',{'Bid','Ask','Last','VWAP','time'});
end
2 Commenti
Rik
il 30 Nov 2020
A persistent variable would be a good start. You may also want to consider using a class.
Risposta accettata
Raynier Suresh
il 3 Dic 2020
This can be done by using either “Persistent” or “Global” variable.
Refer the below code:
function myFun(x)
persistent n;
n = [n x]
end
myFun(10)
n =
10
myFun(12)
n =
10 12
If in case its necessary to move the variable from the function to base workspace you can use “assignin”
Refer the below links for more information:
1 Commento
Rik
il 3 Dic 2020
Both global and assignin should be considered hacks and are rarely if ever needed.
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