Why does it say that it exceeded the array if the array is larger than the data it receives? arduino-matlab

Question

Erwin Avendaño 2019-12-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/494366-why-does-it-say-that-it-exceeded-the-array-if-the-array-is-larger-than-the-data-it-receives-arduino

回答： Erwin Avendaño 2019-12-2

Index exceeds matrix dimensions.

I am sending some data from arduino to matlab but, the error message ->>>Index exceeds matrix dimensions. Error in grafica (line 29 v2(muestras)=(valor(2));<<<-

that appears, it appears to me but after I graph the points, I mean ending the while cycle. I suspect maybe, that you are asking for data that does not exist in the matrix or something like that but I can't solve it. Technically it does not affect me because I manage to graph my points and that error mentions it to me until the end but, I would like you not to tell me that error anymore, how could I solve it? thank you very much

<<<<CODE>>>>>>>>>>>><

function arduinomatlab
n=21
v1=zeros(1,1000);
v2=zeros(1,1000);
delete(instrfind({'Port'},{'COM3'}));
s = serial('COM3','BaudRate',9600,'Terminator','CR/LF');
warning('off','MATLAB:serial:fscanf:unsuccessfulRead');
fopen(s);
muestras=1;
figure('Name','Captura');
xlabel('Tiempo')
ylabel('Aceleracion')
title('Acelerograma')
grid on
hold on
while 1<=n
  
    
    ylim([0 240]);
    xlim([0 0.5]);
    valor=fscanf(s, '%f,%f')';
    v2(muestras)=(valor(2));
    v1(muestras)=(valor(1));
    h=plot(v2(1:muestras),v1(1:muestras),'-')
    drawnow
    muestras=muestras+1;
    delete(h)
end
   
fclose(s);
delete(s);
clear s;
end

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Erwin Avendaño 2019-12-2

The error was in the cycle, I was trying to graph data that was no longer there. I solved it like this:

Erwin Avendaño 2019-12-2

在 MATLAB Online 中打开

function arduinomatlab
v1=zeros(1,1000);
v2=zeros(1,1000);
delete(instrfind({'Port'},{'COM3'}));
s = serial('COM3','BaudRate',9600,'Terminator','CR/LF');
warning('off','MATLAB:serial:fscanf:unsuccessfulRead');
fopen(s);
muestras=1;
figure('Name','Captura');
xlabel('Tiempo')
ylabel('Aceleracion')
title('Acelerograma')
grid on
hold on
while 1
ylim([0 240]);
xlim([0 0.5]);
try
valor=fscanf(s, '%f,%f')';
v2(muestras)=(valor(2));
v1(muestras)=(valor(1));
plot(v2(1:muestras),v1(1:muestras),'-k')
drawnow
muestras=muestras+1;
catch
break
end
end
   
fclose(s);
delete(s);
clear s;
end

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Answer 1

Erwin Avendaño 2019-12-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/494366-why-does-it-say-that-it-exceeded-the-array-if-the-array-is-larger-than-the-data-it-receives-arduino#answer_404303

在 MATLAB Online 中打开

function arduinomatlab
v1=zeros(1,1000);
v2=zeros(1,1000);
delete(instrfind({'Port'},{'COM3'}));
s = serial('COM3','BaudRate',9600,'Terminator','CR/LF');
warning('off','MATLAB:serial:fscanf:unsuccessfulRead');
fopen(s);
muestras=1;
figure('Name','Captura');
xlabel('Tiempo')
ylabel('Aceleracion')
title('Acelerograma')
grid on
hold on
while 1
ylim([0 240]);
xlim([0 0.5]);
try
valor=fscanf(s, '%f,%f')';
v2(muestras)=(valor(2));
v1(muestras)=(valor(1));
plot(v2(1:muestras),v1(1:muestras),'-k')
drawnow
muestras=muestras+1;
catch
break
end
end
   
fclose(s);
delete(s);
clear s;
end