Plotting a cellArray Issue

Hello,

I have a cellarray thats for example: cellArray = {1X8}; and each cell is 1X1023. But im having issues plotting this. Ive tried cell2mat. But this just returns a giant char array:

c = '205020502049205020512051205120............'

I tried seperating every 4 chars and plotting but failed. Im trying to read values from a arduino serial port from one of its analog inputs. Ive tried cellfun(@plot,cellArray); and plot(cellArray{1,1}); but get invalid first argument errors.....at a bit of a loss, and I know its a simple solution just stuck.

[Rik]

Your data seems to be in a char format. Can you provide a small example of your data? You could also attach the entire array in a mat file.

And what exactly is your desired output?

[m j]

hFig = figure('Name',datestr(now),'units','normalized','Color',[0,0,0],...
    'MenuBar','none','DockControls','on');
hAxes1 = subplot(2,2,1);
hAxes2 = subplot(2,2,2);
hPlot1 = plot(hAxes1,NaN,NaN);
assignin('base','hPlot1',hPlot1);
s = serial('COM9');
arrSize = 1;
fopen(s);
j = 1;
Fs=100000;
i = 1;
buffFatman = 1024;
bufferFatman = nan(1,buffFatman);






x = [];
y = [];
celldata2 = [];
z = 0;

while j <= 1024
    if (j==1024)
        %if 1024 values have been reached increment z and store in
        %cell array
        z = z + 1;
        %          temp = bufferFatman';
        %         celldata2{z} = celldata;assignin('base','celldata(j)',celldata(j));
        %plot celldata(i) and then increment
%                set(hPlot1, 'Xdata',1:1-1/Fs:buffFatman,'Ydata',celldata2{1,j});
        j = 1;
        arrSize = arrSize + 1;
        %     disp(arrSize);
        %cell2mat function; A = cell2mat(C);
        celldata2{z} = celldata;
        %     A = cell2mat(celldata2{2});
        A = cell2mat(celldata2{1,j});
        assignin('base','A',A);
        assignin('base','celldata2',celldata2);
     
        pause(0.01);
        i = i + 1;
    end
    x = fscanf(s);
    pause(0.01);

    celldata(j) = cellstr(x);
    assignin('base','celldata',celldata);
    
%     cellfun(@plot,MyCell);
    j = j + 1;
    %after obataing data,store it in buffer and display it
end



%DATA...NOT PART OF CODE
celldata2 = 	1x1023 cell	1x1023 cell	1x1023 cell	1x1023 cell	1x1023 cell	1x1023 cell
%if I use cell2mat as such c = cell2mat(celldata2{1,1});
c = '205020502049205020512051205120502050204820502050205020512050205020492051205020502051204920502048205020502051205020502049205120502051205020502049205120502050204920512051205020502051205020492050204920492048205120512051205020482049205020502051204920512051205020482049205020502050205020492050205020512050205020502050205020502049205120492050205020512050205120502051204920512051205020502049205220502052204920512048205120512049205020492051205120502050204920502050204920502051204920502049205020512050205020512050204920492049205120502050205120492051204920502049204920502049204920492049205020492051205020492048205020492050205120502050205120512049204920492050205020502050204920492050205120492051204920512051205020502049204920492050205120502051205020512052205020502049204920492051205020512050205020492050205020502050205120502050205020492049205020502051204920512051205020492050205020502049205120522051205020492049204920502050205120502050205020502051205020502049205020502050205020502051204920502049205020492050205220502049204920502052205120502050204920512051205120502050205020502050205020492051205020512050205020502051205020502051204920502049205020512050205020492051205120512050204920492049205120502052205020502050205120502050204820492050205020502050205020492050204920492050205020502051205020502049205020502051205020502050205120502051204920512050205020502050204920492050205120502050205020492049205120512052205120502049204920492051205120502050205120512049205020502051204820502051205020492049204920502050205120502050205020492050205020512050204920512050205020512051205020502050204820492051205020492049205020502050204920512051204920502051204920512050205120502051205120502052205120522051204920492051205020512049205120492050205120502051205120502051205020512048205120492051205020502049205120502051204920502049205020512050205020512050204920512049205020502050205020502050205020502049205120502050204920502050204920492051205120502049204920492050204920502050205020492049205020492049204820512049205120512049205020512051205020482049205120512049204920492051204920512050205020502049205020482050204920512049204920502051204920502049205220512051204920502049205120502050205220502049205020492051205020492052205020502050205020512051204920502050205120492051205020502050205020502049205020492050204920502050205120512051204920512050205020502050204920512050205020513204920512050205120512050204920512051205020502051205120512050205020502049205220512051205020512049205020492051204920502050205020512050205020482048205020502051204920502050205020492051204920502050205120502051204920502050204920512049204920502050205120492050205020512049204920492050205120512050205020502051205020502050205120522050204920492049205120512051204920502050205020492050204920502050205020502051205020512048205020502051204920512051205120492050205020512049205020492049205120512050204920492051205020522049205120502050205020512049205020492051205120502050204820502050205120492050205020502051205120492050204920512051205120502051204920512050204920502050205220492050205020502051205020502050204920492051205120492050205020522051205120512052205120492050205120502049205120512050205020502050205120492051205020502050205020502051205020502050205120512049205020502051205020492048205020502050205020492049205120502051205020502050205020502048205120492050204820502050205120502049205020502050205120502049205020512051204920502052205020502049205120492049205020492051205120512051204920492049204920512050205020512050205020512050204820502050205020512051205020512050205020502051205120492050205020502050205120492050204920502050205020502050205020502050205120502051204920502049205020512050204920502050205020502050205020502050205120502051204920502051204820502049205120492051205020512050205120502050205020512049205020502051204920512049205020512051205020502050205020502050205120512050204920492051205020502050205120502050204920492050205020502050204820502050205020492050204920512050205020502050205120502049205120502050204920502051205020502049205020502050205020502050205020502049205020512050205020492051205020502049205020502051205120512049205020502050205120502051205020492048205020512051204920512050'

My desired output is to plot the data in realtime but using hPlot1 and updating the X,Y data, but

im having issues just doing a 1 time plot that displays 1 certain set of time that doesnt update itself.And apologies about the code, I know theres some useless variables and comments,but ive just been getting frusterated with this lol,apologies.

[Rik]

Why are you using assignin? And how can the while loop exit?

Answer 1

[Raghunandan V]

Hi m j,

Can you try something like this?

celldata(j) = str2num(x)

By doing this you are just storing them as numbers but not as str cell. and you can easily plot.

[Rik]

You should use str2double instead.

[Raghunandan V]

The values from arduino COM port is always int :)

[Rik]

If you are getting only a single value it is safer to use str2double (which avoids a call to eval and is therefore not vulnerable to function call injects). A cast to char avoids input type issues.

x=uint8('75');
x=str2double(char(x));