Scratch

FunnyProject · 2011-03-11 12:35:59

I'm great at maths with things like 89364
+ 61839
______
151203
1111
But rubbish with cos, sin, e^ and all that other stuff. All of the descriptions so far are still a bit complicated, so I'm as stuck as someone who's been hit in sticky glue. Any help with what would happen if you did a certain thing with each mathematical function?
<change{ my life on scratch }by( about 1000000000

ty44 · 2011-04-20 18:08:47

<abs( 1 )>
How do you get red "abs" blocks in scratch?
smile

Paddle2See · 2011-04-20 18:11:54

ty44 wrote:
<abs( 1 )>
How do you get red "abs" blocks in scratch?

[/blocks]
The red blocks are obsolete blocks...meaning that they are no longer used in Scratch. "abs" used to have it's own block...but then it became one of the functions you can get from the drop-down menu. You can maybe still find the old style in an older project. But be careful - they might not work any more.

nextstorm · 2011-04-26 21:02:02

dingdong wrote:
I'm probably the youngest "good" scratcher on this website, oh yeah I learned scrolling in steps from you, so thanx

Ahem.
*coughialsomakegoodprojectsijustneverbothertopostthemonthesitesbecauseidontfeellikeitandmostofthemarejusttestsandim1yearyoungerthanyoucough*
tongue

12three · 2011-04-26 21:03:58

nextstorm wrote:
dingdong wrote:
I'm probably the youngest "good" scratcher on this website, oh yeah I learned scrolling in steps from you, so thanx
Ahem.
*coughialsomakegoodprojectsijustneverbothertopostthemonthesitesbecauseidontfeellikeitandmostofthemarejusttestsandim1yearyoungerthanyoucough*

Dude, you signed up way after this post was made.

Pecola1 · 2011-04-27 21:21:05

dingdong wrote:
Moderator Summary:
Sine (sin), cosine (cos), and tangent (tan) are trigonometric functions. They are useful in projects concerning direction. To read more about trigonometry you can view the wikipedia article here.

If you have further, specific questions about these blocks you can ask on this topic.
I have been taught in my algebra class how to use these formulas, but my math teacher didn't mention how to use the formulas on just numbers. So how do I use this formula?
because I still don't understand how I scroll in steps
/ \ / \
<change X by I sin of direction * 1 I * I speed * -1 I>
\ / \ /
/ \ / \
<change Y by I cos of direction * 1 I * I speed *-1 I>
\ / \ /

Wait! Thats the same as:
/ \ / \
<change X by I sin of direction I * I speed * -1 I>
\ / \ /
/ \ / \
<change Y by I cos of direction I * I speed *-1 I>
\ / \ /

Because direction * 1 is the same as direction tongue am i the only one here who sees this? I am NOT good at math BTW I saw someone answer someone on this once though, so that how I figured it out.

Last edited by Pecola1 (2011-04-27 21:21:56)

valoran · 2011-05-16 11:51:20

Man, I still don't really understand how can cos and sin determine how much a piece can spin around it's axis. I know it has something to do with the x y graph but I don't understand how you can calculate a formula to spin an piece for a certain amount. sad

CosmicProjectz · 2011-05-17 23:00:54

Aaaaahhhhhhh So Many Numbers Im So Confused Im In 4th Grade Only!!!!!!!!

CosmicProjectz · 2011-05-17 23:02:42

Just randomly experiment. It's what I do, and it works! big_smile

CosmicProjectz · 2011-05-17 23:04:19

FunnyProject wrote:
I'm great at maths with things like 89364
+ 61839
______
151203
1111
But rubbish with cos, sin, e^ and all that other stuff. All of the descriptions so far are still a bit complicated, so I'm as stuck as someone who's been hit in sticky glue. Any help with what would happen if you did a certain thing with each mathematical function?
<change{ my life on scratch }by( about 1000000000

Dude, 89364 plus 121203 is SOOOOOO easy.

rdococ · 2011-05-22 07:46:04

dingdong wrote:
I'm probably the youngest "good" scratcher on this website, oh yeah I learned scrolling in steps from you, so thanx

I'm even younger.

daychicken · 2011-07-11 09:56:32

How do I change a 2D vector (X,Y) into a direction (D)?

TVflea · 2011-10-20 23:23:33

daychicken wrote:
How do I change a 2D vector (X,Y) into a direction (D)?

[blocks]
<when green flag clicked>
<forever>
<set{ X }to( <direction>
<set{ Y }to( <direction>
<end>
[/blocks]
There you go

Last edited by TVflea (2011-10-20 23:23:46)

kayybee · 2011-10-21 12:22:29

daychicken wrote:
How do I change a 2D vector (X,Y) into a direction (D)?

Since TVFlea's answer had nothing to do with this, I'll answer it.

What you're looking for a is a script that changes two variables, the X and Y of a vector into a direction...

Not a script to go random directions forever.

I hope you mean that x=positive and y=0 being 0 degrees, and x=negative and y=0 being 180. If not, just subtract 90 or however many degrees you want.

mythbusteranimator · 2012-03-29 19:34:08

I'm twelve and doing 9th grade math, so I did pre-trig two years ago and understand everything. But, I don't understand what use sine and cosine have in scratch. I've seen some games shooting cannonballs and that type of stuff, and I've seen sine and cosine when I download, but I do not get how I'd be able to create an arc.
[scratchblocks]
when I recieve (shoot)
forever
change X by (sine) of X
change X by (cosine) of X

jji7skyline · 2012-03-31 22:21:53

You should use [scratchblocks] tongue

iTweak0r · 2012-04-18 11:31:42

Paddle2See wrote:
ty44 wrote:
<abs( 1 )>
How do you get red "abs" blocks in scratch?

[/blocks]
The red blocks are obsolete blocks...meaning that they are no longer used in Scratch. "abs" used to have it's own block...but then it became one of the functions you can get from the drop-down menu. You can maybe still find the old style in an older project. But be careful - they might not work any more.

you should use the new block look (

when gf clicked
say ([abs v] of (-5))

) instead of the old one which looks like

<when green flag clicked>
<say> <abs( -1 )>

Last edited by iTweak0r (2012-04-18 11:33:33)

playzooki · 2012-08-23 15:56:53

dingdong wrote:
I'm probably the youngest "good" scratcher on this website, oh yeah I learned scrolling in steps from you, so thanx

HEY! mad

chongyian · 2012-09-14 08:50:41

This is confusing.... i mean, the sin cos tan, not the explanation...

mythbusteranimator · 2012-09-14 09:24:01

chongyian wrote:
This is confusing.... i mean, the sin cos tan, not the explanation...

It was hard for me to understand, but now i got it.

legobob23o · 2012-09-27 18:19:04

Ooooooooooooo bumpeh! smile (I mean "Bump")

firedrake969_test · 2013-02-25 12:28:37

playzooki wrote:
dingdong wrote:
I'm probably the youngest "good" scratcher on this website, oh yeah I learned scrolling in steps from you, so thanx
HEY!

No need to get into an argument.

Bump.

Scratch

archived forums

#101 2011-03-11 12:35:59

Re: how do I use sin. cos, and tan?

#102 2011-04-20 18:08:47

Re: how do I use sin. cos, and tan?

#103 2011-04-20 18:11:54

Re: how do I use sin. cos, and tan?

ty44 wrote:

#104 2011-04-26 21:02:02

Re: how do I use sin. cos, and tan?

dingdong wrote:

#105 2011-04-26 21:03:58

Re: how do I use sin. cos, and tan?

nextstorm wrote:

dingdong wrote:

#106 2011-04-27 21:21:05

Re: how do I use sin. cos, and tan?

dingdong wrote:

#107 2011-05-16 11:51:20

Re: how do I use sin. cos, and tan?

#108 2011-05-17 23:00:54

Re: how do I use sin. cos, and tan?

#109 2011-05-17 23:02:42

Re: how do I use sin. cos, and tan?

#110 2011-05-17 23:04:19

Re: how do I use sin. cos, and tan?

FunnyProject wrote:

#111 2011-05-22 07:46:04

Re: how do I use sin. cos, and tan?

dingdong wrote:

#112 2011-07-11 09:56:32

Re: how do I use sin. cos, and tan?

#113 2011-10-20 23:23:33

Re: how do I use sin. cos, and tan?

daychicken wrote:

#114 2011-10-21 12:22:29

Re: how do I use sin. cos, and tan?

daychicken wrote:

#115 2012-03-29 19:34:08

Re: how do I use sin. cos, and tan?

#116 2012-03-31 22:21:53

Re: how do I use sin. cos, and tan?

#117 2012-04-18 11:31:42

Re: how do I use sin. cos, and tan?

Paddle2See wrote:

ty44 wrote:

#118 2012-08-23 15:56:53

Re: how do I use sin. cos, and tan?

dingdong wrote:

#119 2012-09-14 08:50:41

Re: how do I use sin. cos, and tan?

#120 2012-09-14 09:24:01

Re: how do I use sin. cos, and tan?

chongyian wrote:

#121 2012-09-27 18:19:04

Re: how do I use sin. cos, and tan?

#122 2013-02-25 12:28:37

Re: how do I use sin. cos, and tan?

playzooki wrote:

dingdong wrote:

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