Attempt to extract field 'ThermocoupleType' from 'mxArray'.
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I'm trying to write code in simulink block editor to take live input data from a thermocouple, through a DAQ system, to display the data on a scope. The thermocouple is a K type thermocouple. If I don't specify the type, I get an error message asking for the thermocouple type. When I specify K type, I get the error 'Attempt to extract field 'ThermocoupleType' from 'mxArray'.'
What should I do?
Code:
function data = Thermocouple()
coder.extrinsic('daq.createSession','addAnalogInputChannel','startForeground','T')
T = daq.createSession('ni');
ch0 = addAnalogInputChannel(T,'cDAQ9185-1D2BD3AMod2',0,'Thermocouple');
ch0.ThermocoupleType = 'k';
data = zeros(1,1000);
data = startForeground(T);
Thanks in advance!
2 Commenti
Venkata Siva Krishna Madala
il 12 Giu 2018
Since "addAnalogInputChannel" is extrinsic, it returns an "mxArray" object, which overrides the data type of "ch0" to be an "mxArray" as well.
In order to solve this error pre-initialize the desired fields / variables, and then assign the value to the field.
Bob Dekraker
il 19 Giu 2018
Modificato: Bob Dekraker
il 19 Giu 2018
I'm not exactly sure what to preinitialize it to. Is this what you were thinking?
function data = Thermocouple()
coder.extrinsic('daq.createSession','addAnalogInputChannel','startForeground','T')
T = daq.createSession('ni');
ch0 = addAnalogInputChannel(T,'cDAQ9185-1D2BD3AMod2',0,'Thermocouple');
ch0.ThermocoupleType = zeros(1,1)
ch0.ThermocoupleType = 'k';
data = zeros(1,1000);
data = startForeground(T);
Thanks
Risposte (1)
cristina9
il 12 Ott 2018
Modificato: cristina9
il 12 Ott 2018
Same quesiton! I call "timedelaynet" to train a neural network on line in the simulink, and then hope to get the weight value of the neural network. I specify the type of the variable in advance, but it does not work.
coder.extrinsic('net'); net.IW{1,1}=zeros(5,4); %error message:Attempt to extract field 'IW' from 'mxArray' [net,tr]=train(net,inputs,targets,inputStates,layerStates);
What should I do?
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