Boolean False when it should be True

Something is wrong with my boolean being rendered: x1=find(data(:,1)==dom(8,2)) . It returns as false but dom(8,2)=8.3 and data(416,1)= 8.3000

• I import the 1250x3 matrix data correctly and the 9x5 matrix dom correctly.
• x2, x3, and x4 are processed correctly
• I tested in the command line that 8.3000==8.3 (returned as true)
• I tried str2num(data(416,1)) just in case, didn't work
• data(:,1)==dom(i,2) is a 0x1 double

My work is really messy so I don't want to post the whole code but I can if someone thinks it might help. I have 9 different data sets represented by i and this code works for a majority of them.

%i represents the dataset loaded into data and the row for dom which is short for domain because I hand selected start and stop points for each dataset

i=8;

x1=find(data(:,1)==dom(i,2));

x2=find(data(:,1)==dom(i,3));

x3=find(data(:,1)==dom(i,4));

x4=find(data(:,1)==dom(i,5));

Also for reference:

>> 8.3000==8.3

ans =

logical

1

>> data(416,1)

ans =

8.3000

>> data(416,1)==8.3

ans =

logical

0

Thank you in advance to anyone who had the patience to look at this

[Jonas]

maybe the difference is very small and not within 3 digits. did you try to subtract the two values, is the result 0?

Answer 1

[Matt J]

dom(8,2) is only 8.3000 to 4 decimal places. You cannot see the differences beyond the 4th decimal unless you use

>> format long