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can you help me solve this error?

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9L_peek
9L_peek on 9 May 2023
Commented: Walter Roberson on 9 May 2023
hey, Im new in this community and this error keep on popping up
Im in need of your help!!
Dot indexing is not supported for variables of this type.
Error in MAGNETORQUER>get_Callback (line 274)
if (length(ud.Data) == 10)
this is the part of the code :
if (length(ud.Data) == 10)
%Acceleration in m/s2
Ax=ud.Data(1)/AccelScaleFactor*9.81 ;
Ay=ud.Data(2)/AccelScaleFactor*9.81;
Az=ud.Data(3)/AccelScaleFactor*9.81;
%Angular speed in deg/s
Gx=ud.Data(5)/GyroScaleFactor;
Gy=ud.Data(6)/GyroScaleFactor;
Gz=ud.Data(7)/GyroScaleFactor;
%Magnetometer data in uT
mx=ud.Data(8)/MagnetScaleFactor;
my=ud.Data(9)/MagnetScaleFactor;
mz=ud.Data(10)/MagnetScaleFactor;
set(handles.axeX,'string',num2str(mx,3));
set(handles.axeY,'string',num2str(my,3));
set(handles.axeZ,'string',num2str(mz,3));
set(handles.dipoleX,'string',num2str(Gxx,3));
set(handles.dipoleY,'string',num2str(Gyy,3));
set(handles.dipoleZ,'string',num2str(Gzz,3));
set(handles.bex,'string',num2str(Ax,3));
set(handles.bey,'string',num2str(Ay,3));
set(handles.bez,'string',num2str(Az,3));

Answers (1)

Andreas Goser
Andreas Goser on 9 May 2023
Dot indexing is a way of accessing data fields in MATLAB structs. The question now is: Is your variable ud a struct? Can you let us know what ud is?
  4 Comments
9L_peek
9L_peek on 9 May 2023
Yes its a part of a while loop Its a data retrieving loop from 2 sensors mpu6050 and a magnetometer
Walter Roberson
Walter Roberson on 9 May 2023
At some point, either at the beginning or after operating for a while, ud is not a struct.
Use
dbstop if error
and run your code and examine ud at the time of the problem.

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