How to plot from an array

Wouter Donkers

2019 4 17

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I'm reading measurement data from my arduino with matlab using Serial communication, that part seems to work but I am now stuck on creating a matrix of those values and making a plot from that matrix. So I tried just adding the values every itteration of the loop but I cannot figure out how to do so.

for ii = 0:Tp:10
    fprintf(s,'Z')              % Sends measurement command to arduino
    A=str2num(fscanf(s));       % Reads measurement from arduino
    pause(Tp)                       % Pause based on previously set time
    Time=   A(1,1);             % Returns only Timestamp (arduino)
    Temp=   A(1,2);             % Returns only Temperature
    RH=     A(1,3);             % Returns only Relative Humidity
end

I thought of adding

plot(Time,Temp) hold on

at the end of every iteration of the loop but that just ends up being a blank figure with the right corresponding numbers on the axes but no data markers

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Wouter Donkers 2019-4-17

在 MATLAB Online 中打开

Thnx for the answer, after applying your code I realised what I was doing wrong. I had the start of ii set to zero so I couldn't use

Time(ii)=A(1,1);

since it would give an error. I assumed this was because I wasn't using the ii as a part of the function which I now realize is a wrong assumption. Code is working now, just had to replace

for ii = 0:Tp:10

with

for ii = 1:Tp:10

and it worked.