This is my code for an estimation of a MISO system:
na= 1;
nb1=1;
nb2=1;
sampleTime = 300; % seconds

inputNames = ["HCL_in", "NaHCO3"];
outputName = "HCL_out";

data = iddata(Dati1_timetable{:,outputName}, Dati1_timetable{:, inputNames}, sampleTime);
sys5 = arx(data, [na nb1 nb2])
and I have this error :
Error using arx (line 84)
the model orders must be compatible with the input an output dimensions of the estimation data.

if I substitute ONLY " inputNames = ["HCL_in", "NaHCO3"]; " with this: " inputNames = HCL_in; " , so from MISO to SISO system identification, all works fine.
Please help me, thanks.This is my code for an estimation of a MISO system:
na= 1;
nb1=1;
nb2=1;
sampleTime = 300; % seconds

inputNames = ["HCL_in", "NaHCO3"];
outputName = "HCL_out";

data = iddata(Dati1_timetable{:,outputName}, Dati1_timetable{:, inputNames}, sampleTime);
sys5 = arx(data, [na nb1 nb2])
and I have this error :
Error using arx (line 84)
the model orders must be compatible with the input an output dimensions of the estimation data.

if I substitute ONLY " inputNames = ["HCL_in", "NaHCO3"]; " with this: " inputNames = HCL_in; " , so from MISO to SISO system identification, all works fine.
Please help me, thanks. This is my code for an estimation of a MISO system:
na= 1;
nb1=1;
nb2=1;
sampleTime = 300; % seconds

inputNames = ["HCL_in", "NaHCO3"];
outputName = "HCL_out";

data = iddata(Dati1_timetable{:,outputName}, Dati1_timetable{:, inputNames}, sampleTime);
sys5 = arx(data, [na nb1 nb2])
and I have this error :
Error using arx (line 84)
the model orders must be compatible with the input an output dimensions of the estimation data.

if I substitute ONLY " inputNames = ["HCL_in", "NaHCO3"]; " with this: " inputNames = HCL_in; " , so from MISO to SISO system identification, all works fine.
Please help me, thanks. arx, miso, syste identification MATLAB Answers — New Questions

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