Find the elements in matrix that are not within the specified range

Hello all,

This is question is the extension of this question.

The solution provided by dpb is shown below:

lo=207; hi=253;                  % set the limits desired
ix=iswithin(loads,lo,hi);        % check all are ok, ix is logical array of locations
isOK=all(ix);                    % if T, all are ok for each column
if all(isOK)
  fprintf('All is well\n')
else
  bad=sum(~isOK);                % number failed columns (loads)
  fmt=['Load %2d' repmat(', %2d',1,bad-1) '\n']  % format string to print offending load(s)
  fprintf(fmt,find(~isOK))       % and print the message
  fprintf('Total number of loads failed: %d\n',bad)  % and the total
end

iswithin is a utility function of dpb

type iswithin
  function flg=iswithin(x,lo,hi)
  % returns T for values within range of input
  % SYNTAX:
  %  [log] = iswithin(x,lo,hi)
  %      returns T for x between lo and hi values, inclusive
      flg= (x>=lo) & (x<=hi);

The program needs to be modified in the following way. I have a matrix 288x55. I need to find the elements in matrix that are not within the specified range. Unlike the question above (program returned true if only one element is not within the specified range), this program should return true only if two elements one after another in a matrix are not within the range.

Note that program needs to return true only if elements are one after another.

The limits are 207 and 253.

For example, if a given matrix is:

232  209  237
241  226  233
237  229  235
205  215  205
227  227  219
227  240  227
242  221  238
245  205  234
217  218  229
218  233  204
232  221  213
230  241  246
232  223  232
217  233  230
214  223  226
229  238   *265*
245  210   *262*
238  250  228
229  227  236
225  228  246
216  213  228
241  230  242
240  229  242
228  215  233
235  237  214
233  *254*   240
241  *255*   231
254  229  249

Then isOK should return 0 1 1

Any help is greatly appreciated.

Please feel free to ask questions if the problem needs some clarification.

Thank you

[h612]

If val is a vector where you are storing the found values and M is a matrix,

[val index]=find(M>limit)

[dpb]

"this program should return true only if two elements one after another in a matrix are not within the range."

Two and only two more than one?

Also, what's the definition of "elements one after another in a matrix", precisely? In memory order, column order, row order, does count start over at each column/row...?

[Yesbol]

Thank you for your comment, dpb. Sorry I did not make it clear. I made some modifications. Hope it will clarify.

Answer 1

[Andrei Bobrov]

a = [232  209  237
241  226  233
237  229  235
205  215  205
227  227  219
227  240  227
242  221  238
245  205  234
217  218  229
218  233  204
232  221  213
230  241  246
232  223  232
217  233  230
214  223  226
229  238   265
245  210   262
238  250  228
229  227  236
225  228  246
216  213  228
241  230  242
240  229  242
228  215  233
235  237  214
233  254   240
241  255   231
254  229  249];

n = size(a,2);
t = a < 207 | a > 250;
k = cumsum([false(1,n);diff(t) == 1]).*t;
out = any(histc(k,1:max(k(:)+1)) >= 2);