accel{i}=traci.vehicle.getAcceleration(IDList);

[shuowang572875852]

I want to get the acceleration of the vehicle at each time step. Since the input parameter for obtaining acceleration is the vehicle ID, I obtained the vehicle ID for each time step, but the following error was obtained . The follows are my codes :

clc;
clear all;
import traci.constants
scenarioPath=['F:\software\SUMO配置文件\bin\quickstart\quickstart.sumocfg'];
system(['sumo-gui -c ' '"' scenarioPath '"' ' --remote-port 8813 --start&']);
traci.init

SIM_STEPS = [1 900];
beginTime = SIM_STEPS(1);
duration = SIM_STEPS(2);
endTime = SIM_STEPS(1) + SIM_STEPS(2) - 1;

for i = 1: duration
traci.simulation.step();
IDList{i} = traci.vehicle.getIDList();
accel{i}=traci.vehicle.getAcceleration(IDList);
end
traci.close()

I used the traci4matlab and the above are my codes , the ''duration'' is the "simulation duration time ",the error logs are :

error use uint8
Unable to convert from cell to uint8.

error traci.beginMessage (line 23)
traci.packInt32(length(objID)) uint8(objID)];

error traci.sendReadOneStringCmd (line 10)
traci.beginMessage(cmdID, varID, objID);

error traci.vehicle.getUniversal (line 21)
result = traci.sendReadOneStringCmd(constants.CMD_GET_VEHICLE_VARIABLE,varID,vehID);

error traci.vehicle.getAcceleration (line 12)
accel = traci.vehicle.getUniversal(constants.VAR_ACCELERATION, vehID);

error quickstart (line 19)
accel{i}=traci.vehicle.getAcceleration(IDList);