+or-

[moby]

Thanks folks. I think Dwaynes answer is the way to go. I will try it and let you know how I get on.

[Dwayne]

The way that works is the following.

Lets say we are checking resisters, and need to know if they are within a certain tolerance....

say within 5 pecent....

Your known resistance is 1000 OHMS, and 5 percent is 50 ohms

The ABS function works as the following:

Lets say TEST is 1500 homes

ABS(test-1000)=500

Thus If (test-1000)<50 then output good resistor! (but its not less than 50)

Lets say TEST=900


ABS(test-900)=100 (if the value is negative, it changes to postive)

Thus If (test-1000)<50 then output good resistor! (but its not less than 50)


Lets say TEST = 970
ABS(test-1000)=30

Thus If (test-1000)<50 then output good resistor! (Wonderful!! good part)

Dwayne

[moby]

I had never thought about the ABS function before. Many thanks, it appears to work fine.

[moby]

Well, I thought it worked fine. Now having added actual code to my prgramme I can't get it to compile. It gives an error "bad expression or missing then" for the line with ABS in it:

For word_no=0 to res_max
if (abs(adval-id_res[word_no]))<=((id_res[word_no]*res_tol)/100) then
answer=ok
goto endsub
endif
next word_no

Am I doing something stupid?


Edit: It's alright. I just forgot how to do arrays!!!! Seems OK now.

[Dwayne]

Hello Moby,


Moby>>if (abs(adval-id_res[word_no]))<=((id_res[word_no]*res_tol)/100) then

I believe you have 1 too many parentheses <sp> on your if statement...
lets divid it up a little ok??

yours:
if (abs(adval-id_res[word_no]))<=((id_res[word_no]*res_tol)/100) then

Divided up:

if (abs (adval-id_res[word_no]) ) <=((id_res[word_no]*res_tol)/100) then


if you notice, your ending parenthises <sp> end before your less than or equal sign....
It probably should look like this:
if(XXXXX<=YYYY) then zzzz

if ( abs(adval-id_res[word_no]) <=((id_res[word_no]*res_tol)/100) ) then

Another format is
if xxxxx<=yyyyy then zzzz

if abs(adval-id_res[word_no]) <=((id_res[word_no]*res_tol)/100) then

Dwayne

[moby]

Yes, I think that was another problem. It does seem to be working now.
Thanks.