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can you help me solve this error?

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9L_peek
9L_peek 2023-5-9
评论： Walter Roberson 2023-5-9
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));

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回答（1 个）

Andreas Goser
Andreas Goser 2023-5-9
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 个评论
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9L_peek
9L_peek 2023-5-9
Yes its a part of a while loop Its a data retrieving loop from 2 sensors mpu6050 and a magnetometer
Walter Roberson
Walter Roberson 2023-5-9
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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