Operator ~= matrix dimensions doesn't match

Question

Tammy Chen 2016-8-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/301423-operator-matrix-dimensions-doesn-t-match

回答： James Tursa 2016-8-30

Hi all, so I'll just cut to the chase

fidO = fopen('pvtsort.xls','w+');
d = dir('*txt'); 
for i = 1:length(d)
  fid = fopen(d(i).name, 'r');  % open all input txt files, no array
  values = textscan(fid,'%*s%*s%s','HeaderLines',4, 'Delimiter','\t');% read only the 3rd column
  for n = 1
    m = num2str(n * i)
    fprintf(fidO,'%s%s\t','Trail',m);
  end
  for j = 1:length(values{1,1})
    pvt = values{1,1}
    fprintf(fidO,'%s\t',pvt{j});   %note "the curlies" to dereference cellstr to char
  end
  fprintf(fidO,'\n')
  for f = pvt{j}(pvt{j}~=['False start'])
    s = str2double('f')
    a = mean(s)
    b = median(s)
    g = prctile(s,5)
    h = prctile(s,95)
    k = prctile(s,10)
    o = prctile(s,90)
    fprintf(fidO,'%s\t%d\t%d\t%d\t%d\t%d\t%d\n','mean; median; lower%5; higher%5; lower%10; higher%10',a,b,g,h,k,o)
  end
  fid = fclose(fid);
end
fidO = fclose(fidO)

In the code above, I'm trying to have Matlab calculate the stats (mean, median, and a bunch of percentiles) for a string of data I pulled from several text files. Problem is, the values in the strings are not all numbers, some are 'False start'. How can I have Matlab ignore the 'False start' and calculate my stats without them? As you can see, I tried the ~= operator, but ran into issue with the error "Error using ~=. Matrix dimensions must agree.". I also tried NaN the "False start" but that seems even more problematic than using '~='. Any ideas how I can format my data so the matrices match for the ~= operator?

Attached is a screenshot of my workspace from when I ran into this error.

Thanks for looking into this.