Re: HELP :: if() problems encountered

[shoker_17]

Hmm...actually, i believe that my for loop and if statement are correctly
logically but it seems that i have problem retrieving those values less than
1 from the matrix. This seems to me that either i use the "if()" wrongly or
the system cannot recognise the "<1" condition.

paul,

your statement cant seem to work. instead of those values less than zero, it
only manage to find the following output but thanks anyway! : )

=======================output from paul's suggestion=====================

2 1
 4 1
 6 1
 8 1
 10 1
 11 1
 12 1
 13 1
 14 1
 16 1
 18 1
 20 1
 22 1
 24 1
 26 1
 28 1
 30 1
 32 1
 2 2
 4 2
 6 2
 8 2
 10 2
 12 2
 14 2
 15 2
 16 2
 18 2

=======================output from paul's suggestion=====================

shoker





Paul Roberts wrote:
> 
> If you want the row and column indicies for each non-zero element,
> rather than setting them to zero, you could use:
> 
> [i,j] = find(monoColor < 1);
> 
> i will hold the row indicies for each element, and j will hold the
> column indicies. So, the first element with intensity less than 1 is:
> 
> monoColor(i(1),j(1))
> 
> Paul
> 
> On 9/15/06, Quentin Spencer <address@hidden> wrote:
>> shoker_17 wrote:
>> > Status            : Beginner
>> >
>> > Version           : Octave 2.1.72
>> > Purpose          : image Processing
>> > Problem          : If () statement
>> > Descriptions   : I was trying to manipulate a matrix in image
>> intensity. The
>> > main idea was to retrieve those data that were less than 1 from
>> monoColor.
>> >
>> > ##to find the number of consecutive black pixels horizontally
>> > ##monoColor : image intensity of 32 rows and columns
>> > for x = 1 : row
>> >       for y = 1 : column
>> >               if(monoColor(x,y) < 1)                 //tryin to find
>> values in monoColor
>> > less than 1
>> >                       test(x,y)= monoColor(x, y);
>> >               endif
>> >           endfor
>> > endfor
>> >
>> > In the above code, i was trying to find the values in the matrix which
>> are
>> > less than 1.
>> > However, to my dismay, I did not manage to get results i wanted.
>> Instead, i
>> > obtained the same number of rows and columns. Besides thism the values
>> > smaller than 1 and 1 were also obtained.
>> >
>> > Maybe i used the syntax wrongly  else "<1" doesnt seems to work at all.
>> > *weird*
>> >
>> > =============some monoColor image intensity==================
>> >
>> > 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
>> >  1 1 1 1 0.992156862745098 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
>> > 0.996078431372549 1 0.988235294117647 1 0.996078431372549
>> 0.996078431372549
>> > 1
>> >  0.988235294117647 1 1 1 1 1 0.988235294117647 1 1 1 1 1 1 1 1 1 1 1 1
>> 1 1 1
>> > 1 1 0.996078431372549 1 0.992156862745098 1 0.988235294117647 1
>> > 0.996078431372549 0.996078431372549
>> >
>> > =============some monoColor image intensity==================
>> >
>> > =============corresponding values in test array=================
>> >
>> >  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> >  1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
>> >  0 0 0 0 0.992156862745098 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>> > 0.996078431372549 0 0.988235294117647 0 0.996078431372549
>> 0.996078431372549
>> > 0
>> >  0.988235294117647 1 1 1 1 1 0.988235294117647 1 1 1 1 1 1 1 1 1 1 1 1
>> 1 1 1
>> > 1 1 0.996078431372549 1 0.992156862745098 1 0.988235294117647 1
>> > 0.996078431372549 0.996078431372549
>> >
>> > =============corresponding values in test array=================
>> >
>> > H E L P !!
>> >
>>
>> It looks like what you're trying to do is set all the values that are
>> ==1 to zero. Is that right? See if the following give you the results
>> you were expecting:
>>
>> test = monoColor;
>> test(test==1) = 0;
>>
>>
>> Quentin
>>
>> _______________________________________________
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