writing "if" command for a>f>c

how can write if command for < and > together. for example if 1.01>a>0.9 then do cprintf('g','ok') else do cprintf('r','not ok'). when i write this like this: if 1.01>a>0.9 cprintf('g','ok'); else cprintf('r','not ok');

matlab only considers 1.01>a

thanks alot

Answer 1

[Paulo Silva]

There's no cprintf on MATLAB, use disp to show simple messages on the command line or fprintf for extra features.

a=1;
if 1.01>a && a>0.9
   disp('ok') 
else
   disp('not ok') 
end

[mohammad]

why dosnt "if 0.9<a<1.01" work?

[Paulo Silva]

that's the way MATLAB works, you can't do everything you want

[mohammad]

dear Paulo how can write command for "or"?

if a>5 *or* a<3

disp('ok')

else

disp('not ok')

end

[Paulo Silva]

or(a>5, a<3) %first way to do the or

a>5 || a<3 %second way to do the or

Both ways do the same thing

doc or %see the documentation of the or function, same goes for the and function

[mohammad]

really thanks Paulo

Answer 2

[geomod]

I cannot say why but, if you write:

if 0.9<a<1.01

OR

if 1.01>a && a>0.9

then it should run...

[Paulo Silva]

you are right about the syntax of the if operation, +1 vote

[mohammad]

thanks 4 reply

if 0.9<a<1.01 not work

but 1.01>a && a>0.9 works

if there is no way to work in form like 0.9<a<1.01 , i use && form?

[Walter Roberson]

if 0.9<a<1.01

means

if (0.9<a)<1.01

The part in () will evaluate to a logical value, either false (numeric 0) or true (numeric 1). Both 0 and 1 are < 1.01 so the overall expression would always evaluate as true.

MATLAB has no three-part logical operators at all, no built in way to test ranges.

If you wanted to really mess with the mind of the person reading the code, you could use:

if ~isempty(0.9:a-0.9:1.01)