matlab crash

Hello

When I try to load a signal of 10 million data points and plot it, the plot goes through fine but I can't add data cursors to it. When I reduce the number of data points to 7 million, everything works fine.

      [anasignal,path] = uigetfile('*.csv','Select the .csv file to analyze');
  if isequal(anasignal,0)
     disp('User selected Cancel');
  end
  asig = csvread(fullfile(path, anasignal),15,0);
  prompt = {'Enter the starting point:','Enter the ending point:'};
  dlg_title = 'Enter the limits';
  num_lines = 1;
  def = {'1','2'};  %default values for the inputs
  answer = inputdlg(prompt,dlg_title,num_lines,def);
  ErrStatus=0;
  if isempty(answer)
      disp('User canceled the input')
      ErrStatus=1;
  else
      if (strcmp(answer{1},'') || strcmp(answer{2},'')) %empty strings
          disp('Error: Empty inputs not allowed')
          ErrStatus=1;
      else
          ulimit=str2double(answer(2));
          llimit=str2double(answer(1));
      end
  end

if isempty(ulimit) || isempty(llimit)   %empty array
    disp('Error: Empty inputs not allowed')
    ErrStatus=1;
end

%you might also need to verify the size of the inputs
if numel(ulimit)>10000000 || numel(llimit)<1   %empty array
    disp('Error: Arrays not allowed')
    ErrStatus=1;
end
aamp = asig(llimit:ulimit-1,2);%vary this to get more samples
ts = asig(2,1) - asig(1,1);%sampling rate calculated automatically
tim = [llimit-llimit:ulimit-llimit - 1]*ts;%vary this in accordance with aamp
time = tim';%transposed to get a column vector for plotting
ax1 = subplot(2,1,1);plot(time, aamp);

asig happens to be a .csv file with 10 million data points. I can control the number of points to plot by the variables ulimit and llimit. Is this a memory problem? asig happens to be an array of double's using up 160000000 bytes in memory. Can I improve this by converting asig to another data type without losing information?

On a separate note, I am reading the .csv file which I took from an oscilloscope. The Oscilloscope puts out a lot of unwanted information before the data starts appearing from row 15. Thats why I have to say

asig = csvread(fullfile(path, anasignal),15,0);

in my code. Is there a way to avoid this?

Thanks

Answer 1

[Daniel Shub]

The highest resolution monitors (2560x1440) only have 3.6 million pixels. Assuming MATLAB would plot each data point as a single pixel, and it won't, you would need at least 3, and maybe as many as 4000, monitors. In other words, MATLAB isn't really plotting all your data points.