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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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.
1 Commento
hosein Javan
il 12 Ago 2020
that means the right side is empty. no data has been read or the data is lost. check again matrix "B"
Risposte (1)
VBBV
il 9 Feb 2023
Modificato: VBBV
il 9 Feb 2023
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 Commento
Walter Roberson
il 9 Feb 2023
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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