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+--- Thread: Syntax error... or am I doing something wrong? (/thread-6297.html)
Syntax error... or am I doing something wrong? - farefernandez - 05-24-2016 06:04 AM
I don't seem to be able to enter a number containing fractions in polar coordinates.
Something as simple as
1/2v50 (v would be the angle symbol).
raises a syntax error.
I've tried with different combination of parenthesis... but it still get a syntax error.
Am I doing something wrong?
Thanks!
RE: Syntax error... or am I doing something wrong? - Aries - 05-24-2016 07:56 AM
I suppose this happens in the HOME, in the CAS mode does work fine.
Best,
Aries ;-)
RE: Syntax error... or am I doing something wrong? - DrD - 05-24-2016 09:44 AM
Have you tried using the [Shift][X] (the multiply key), for the angle symbol?
1/(2∡50) ==> Result(angle mode).
-Dale-
RE: Syntax error... or am I doing something wrong? - farefernandez - 05-24-2016 12:27 PM
(05-24-2016 09:44 AM)DrD Wrote: Have you tried using the [Shift][X] (the multiply key), for the angle symbol?
1/(2∡50) ==> Result(angle mode).
-Dale-
The problem is not the angle symbol. Basically I can enter:
1∡90
but not:
1/2∡90
Or even:
10^2∡90
In Cas mode it seems to work but i wonder why it doesn't in Home...
Thanks!
RE: Syntax error... or am I doing something wrong? - DrD - 05-24-2016 01:43 PM
When the polar value is completely represented, in the two examples you provided, they did work in [Home] r10077. Copy/paste separates the angle parameter, and makes it look like:
1/2 ∡90, and 10^2 ∡90; instead of 1/(2∡90), and 10^(2∡90).
That's probably not the issue, but the examples paste into the command line separating the angle, which, coincidentally, DOES cause a syntax error. If the polar value is enclosed in parentheses, (not strictly required), there should be no issue (I hope!).
RE: Syntax error... or am I doing something wrong? - Tim Wessman - 05-24-2016 02:33 PM
(05-24-2016 06:04 AM)farefernandez Wrote: Something as simple as
1/2v50 (v would be the angle symbol).
How is that simple? Is that (1/2)<90? 1/(2<90)? (1/2)*1<90?
When you start getting even more complicated things, how does the angle symbol behave in terms of order of operations?
RE: Syntax error... or am I doing something wrong? - informach - 05-24-2016 03:22 PM
Hi!:
See, the attached images.
You needed configure, in HOME ...
Degrees
a+bi or (a,b) ... is same
Then, write ...
(1/2,50) ...
With Shift and * X (angle symbol), then ...
RE: Syntax error... or am I doing something wrong? - leprechaun - 05-25-2016 05:10 AM
In cas something like
1<pi returns -1+1.0780...E-14.
1<(pi/2) returns 5.3903...E-15+i
I am surprised to see these results in the cas. I always thought that the cas would treat everything symbolically so that pi would be recognized.
Is there an explanation for these results and/or would it be a problem to catch such special cases?
RE: Syntax error... or am I doing something wrong? - informach - 05-25-2016 01:56 PM
Hi!, leprechaum:
With complex (a+bi), or (a,b) and in, degrees (but, not CAS) ...
(1,PI) = 1+PI*i
(1,PI/2) = 1+PI/2*i
See, the left image ...
In Polar, CAS and degrees.
See, the other image ...
Note: This is checked with Wolfram Alpha, too.
Kind Regards.
informach