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Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 0-by-0.

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Muhammad Hazrul
Muhammad Hazrul 2020-8-12
评论： Walter Roberson 2023-2-9
if ~isempty(instrfind)
fclose(instrfind);
delete(instrfind);
end
A = zeros(64,1);
B = zeros(64,1);
C = zeros(64,1);
D = zeros(64,1);
Arduino=serial('COM3','BaudRate',9600);%!!!!!!!!need to change the port for windows!!!!!!
fopen(Arduino);
writedata=uint16(500); %0x01F4
fwrite(Arduino,writedata,'uint16') %write datac
for s = 1:1
for i=1:64 %read 64 lines of data
%A(i,1) = fscanf(Arduino,'%f')
A(i,1) = fscanf(Arduino,'%f');
end
B = A;
D(1,1) = abs(B(3,1)-B(4,1));
D(2,1) = abs(B(4,1)-B(5,1));
D(3,1) = abs(B(5,1)-B(6,1));
D(4,1) = abs(B(6,1)-B(7,1));
D(5,1) = abs(B(7,1)-B(8,1));
D(6,1) = abs(B(12,1)-B(13,1));
D(7,1) = abs(B(13,1)-B(14,1));
D(8,1) = abs(B(14,1)-B(15,1));
D(9,1) = abs(B(15,1)-B(16,1));
D(10,1) = abs(B(16,1)-B(9,1));
D(11,1) = abs(B(17,1)-B(18,1));
D(12,1) = abs(B(21,1)-B(22,1));
D(13,1) = abs(B(22,1)-B(23,1));
D(14,1) = abs(B(23,1)-B(24,1));
D(15,1) = abs(B(24,1)-B(17,1));
D(16,1) = abs(B(25,1)-B(26,1));
D(17,1) = abs(B(26,1)-B(27,1));
D(18,1) = abs(B(30,1)-B(31,1));
D(19,1) = abs(B(31,1)-B(32,1));
D(20,1) = abs(B(32,1)-B(25,1));
D(21,1) = abs(B(33,1)-B(34,1));
D(22,1) = abs(B(34,1)-B(35,1));
D(23,1) = abs(B(35,1)-B(36,1));
D(24,1) = abs(B(39,1)-B(40,1));
D(25,1) = abs(B(40,1)-B(33,1));
D(26,1) = abs(B(41,1)-B(42,1));
D(27,1) = abs(B(42,1)-B(43,1));
D(28,1) = abs(B(43,1)-B(44,1));
D(29,1) = abs(B(44,1)-B(45,1));
D(30,1) = abs(B(48,1)-B(41,1));
D(31,1) = abs(B(49,1)-B(50,1));
D(32,1) = abs(B(50,1)-B(51,1));
D(33,1) = abs(B(51,1)-B(52,1));
D(34,1) = abs(B(52,1)-B(53,1));
D(35,1) = abs(B(53,1)-B(54,1));
D(36,1) = abs(B(58,1)-B(59,1));
D(37,1) = abs(B(59,1)-B(60,1));
D(38,1) = abs(B(60,1)-B(61,1));
D(39,1) = abs(B(61,1)-B(62,1));
D(40,1) = abs(B(62,1)-B(63,1));
Hom(:,s) = D;
end
Currently facing this error. We are trying to read 3V input from mux via Arduino .Please help.
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 0-by-0.

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回答（1 个）

VBBV
VBBV 2023-2-9
编辑：VBBV 2023-2-9
for i=1:64 %read 64 lines of data
%A(i,1) = fscanf(Arduino,'%f')
%A(i,1) = fscanf(Arduino,'%f');
A(i,1) = read(Arduino,64,"uint16")
end
As you are trying to read data from serial port device, Matlab recommends to use read function instead of fscanf to read data. fscanf seems a better option to read data from files. The matrix B seems to be empty since nothing has been read. It also appears, that serial function is not recommended by Matlab.
  1 个评论
Walter Roberson
Walter Roberson 2023-2-9
you would only use read() if you switch to serialport()
In this kind of situation you would readline() and sscanf() or potentially str2double(). read() is binary read like fread() not like fscanf

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