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| Grave 720th Post
 
Red Carpet Regular Member
  
    
    
|  "Re(2):Anyone a trig wiz?"
, posted Thu 9 Oct 00:47
quote:
I guess I could just look it up.
Given the object's direction and the direction you want to check, you could subtract one from the other to get the relative direction.
The object's speed is one side of a right triangle, and the relative direction is the angle of one corner of that side. The speed you are checking is the other line connected to that corner. The right angle is on the other side of the line representing the speed you are checking for.
Assuming that works to check speed, I just need to use the trig function that will tell the length of the check side given the relative angle and the length of the object's speed side.
I'd love to help, but I nearly failed out of math in high school, but since I got a 600 on my math SAT score, I now have it waived in college... If you have writing problems, let me know, but numbers are the enemy. Perhaps someone else can help, though.
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| Myst
44th Post
Rare Customer
| "Re(1):Anyone a trig wiz?" , posted Thu 9 Oct 06:36:
quote:
I have an object moving in a direction at a speed. I want to check how fast that object is moving in a given direction.
For example, an object is moving in direction 0 degrees at speed 1.
In direction 90 degrees the speed of that object is 0.
In direction 180 degrees the speed of that object is -1.
In direction 45 degrees the speed of that object is the square root of .5, I think.
This is correct.
quote:
I guess I could just look it up.
Given the object's direction and the direction you want to check, you could subtract one from the other to get the relative direction.
The object's speed is one side of a right triangle, and the relative direction is the angle of one corner of that side. The speed you are checking is the other line connected to that corner. The right angle is on the other side of the line representing the speed you are checking for.
Assuming that works to check speed, I just need to use the trig function that will tell the length of the check side given the relative angle and the length of the object's speed side.
This also seems correct, but I just woke up and it's 9:30 in the morning, not the best place to be.
I'll let a friend of mine read this thread and we can confirm that you're correct.
Correct me if I'm wrong, but isn't this stuff grade 10 or 11 Math?
I'm in Grade 12 Calculus (ugh, which I have this afternoon as my only class today), so I'm pretty sure that it's not learned in Grade 12.
[this message was edited by Myst on Thu 9 Oct 06:37] |
| Gen 2047th Post
Platinum Carpet V.I.P- Board Master
    
    
 
| "Re(2):Anyone a trig wiz?" , posted Thu 9 Oct 13:32
quote:
I have an object moving in a direction at a speed. I want to check how fast that object is moving in a given direction.
For example, an object is moving in direction 0 degrees at speed 1.
In direction 90 degrees the speed of that object is 0.
In direction 180 degrees the speed of that object is -1.
In direction 45 degrees the speed of that object is the square root of .5, I think.
This is correct.
I guess I could just look it up.
Given the object's direction and the direction you want to check, you could subtract one from the other to get the relative direction.
The object's speed is one side of a right triangle, and the relative direction is the angle of one corner of that side. The speed you are checking is the other line connected to that corner. The right angle is on the other side of the line representing the speed you are checking for.
Assuming that works to check speed, I just need to use the trig function that will tell the length of the check side given the relative angle and the length of the object's speed side.
This also seems correct, but I just woke up and it's 9:30 in the morning, not the best place to be.
I'll let a friend of mine read this thread and we can confirm that you're correct.
Correct me if I'm wrong, but isn't this stuff grade 10 or 11 Math?
I'm in Grade 12 Calculus (ugh, which I have this afternoon as my only class today), so I'm pretty sure that it's not learned in Grade 12.
Depends on your school. In my school they offered trig but didn't teach it.
I'm trying to do something fairly complicated and I was hoping I could use relatively simple trig to approxime certain physics and not have to find an old calculus book. I didn't know this program could perform "cos" until a day ago, and then I just need to remember which to use, cos, sin, tan. Before I knew it had the cos function I practically derived trig within the program and had 10 lines of code approximating what "cos" would do in one line.
I got it to work like 90% at this point.
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| Myst
44th Post
Rare Customer
| "Re(3):Anyone a trig wiz?" , posted Thu 9 Oct 18:10
quote:
Depends on your school. In my school they offered trig but didn't teach it.
I'm trying to do something fairly complicated and I was hoping I could use relatively simple trig to approxime certain physics and not have to find an old calculus book. I didn't know this program could perform "cos" until a day ago, and then I just need to remember which to use, cos, sin, tan. Before I knew it had the cos function I practically derived trig within the program and had 10 lines of code approximating what "cos" would do in one line.
I got it to work like 90% at this point.
Everything you said seems to be right. Having access to sine, cosine and tangent really helps.
If you're using it for something physics related, I would recommend using Interactive Physics to test it first, especially if it's something you're trying to program.
I personally use it and it seems to help at least a little bit.
Usually I find it a huge time saver. Instead of running the program over and over again, I just create it there, tune the fine details and use that in the program.
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| Gen 2048th Post
Platinum Carpet V.I.P- Board Master
| "Re(4):Anyone a trig wiz?" , posted Fri 10 Oct 03:19
quote:
Depends on your school. In my school they offered trig but didn't teach it.
I'm trying to do something fairly complicated and I was hoping I could use relatively simple trig to approxime certain physics and not have to find an old calculus book. I didn't know this program could perform "cos" until a day ago, and then I just need to remember which to use, cos, sin, tan. Before I knew it had the cos function I practically derived trig within the program and had 10 lines of code approximating what "cos" would do in one line.
I got it to work like 90% at this point.
Everything you said seems to be right. Having access to sine, cosine and tangent really helps.
If you're using it for something physics related, I would recommend using Interactive Physics to test it first, especially if it's something you're trying to program.
I personally use it and it seems to help at least a little bit.
Usually I find it a huge time saver. Instead of running the program over and over again, I just create it there, tune the fine details and use that in the program.
Thanks I'll check it out.
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| Gen 2052th Post
Platinum Carpet V.I.P- Board Master
| "Re(9):Anyone a trig wiz?" , posted Sat 11 Oct 17:24
quote:
They tend to only share when they find we are first or last to support their point / get TV ratings. If they found we were closer to the middle it wouldn't serve their agenda as much and they wouldn't share.
Who the hell's they? I hope this isn't another "liberal media" tirade or something. And I am serious about the dead end stuff.
"Every time somebody decides to do a study, we seem to be first or last.
First in number of drug-related homicides, last in literacy, that kind of thing.
It'd be embarrassing if I cared. "
"Who the hell's they?"
I assumed you were talking about TV and news paper reports when they say 'our country is first or last in something. They are the people find a study or pay for a study in which the country is first or last in something. Then we are talking about either someone who has media access who uses that study to either support their argument, or say a TV station that shares the story for ratings. If you're talking about the assortment of studies from a scientific journal the country shouldn't always be first or last in everything.
Like say you are in school and your teach makes you write a paper that shows America is the richest country in the world. Now I think America is basically the richest country so those of you who will get angry at the idea that it's not should just relax. This is just an example. Say you found data that said our federal defecit is billions of dollars and continuously growing, or you found Luxembourg's GDP per capita is higher than America's GDP per capita, or you find other countries that have a lower percentage of people below the poverty line than America. This data wouldn't support the argument that America is the world's richest country. So in order to fill the paper you look for other data. You find our minimum wage is higher than countries x, y, and z, and put that in the paper, or you find Bill Gates' estimated wealth and say that he's an American and he's the world's richest person, and put that in the paper.
If you included any data addressing America's wealth America wouldn't be first every single time, but if you put data that shows America first it supports the arguement.
In a similar way an agendaist might shop for the study that best makes his arguement. Say he find one study where America is number one, another study on the same thing done by a different group that shows America as number 5, and another study on a related sujbect that works against his argument. If he were seeking truth he might share all the studies, but if he just wanted sell his agenda he might just use the study that shows America is #1 in support of his argument.
A TV fake-news show that just wants ratings will share a study where America is at an extream in order to vibrate it's viewers. If it's a subject which is mediocre in entertainment level, it's less likely to get on TV, and extermity tends to be more entertaining. Entertainment doesn't translate to importance or relavance.
There are constantly new studies being made in a variety of subjets in which a county might rank in any position on a scale. Just that they are not all shared.
"I hope this isn't another "liberal media" tirade or something."
What do you mean?
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