Article: Matric pass rate improved in 2012

Sinbad said:
That would be 2D with colour being the 2nd dimension.
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no 2d implies that there are two axis. (in reality a line or even a point cannot be in dimension as it always has a width.) However we use lines to represent dimension.

In engineering for example, forces are resolved to their x, y and z dimension. Then they are added in 1 dimension each and then the final resultant is found in 3d.

You use 1 dimensional analysis to solve a 3d problem.

you can also use a number line (getalle lyn, )

1 2 3 4 5 6 7 8 9 10.....

this is a basic form of a 1d graph, it proves that 10 is bigger than 1.
1d graphs are quite useless to be honest. They can be better represented with a 2d graph, but it doesn't mean that they do not have a use at all.
 
Nicodeamus said:
you draw lines ontop of each other. The length represents the magnitude, the longest one is the biggest. That is all that you can use it for.

------------------ 1m
----------------------------------------------2m

draw these two ontop of each other. (in different colours)

1m is longer than 2m, now you can substitute m for any quantity.
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Good Lawdie. The simplicity had me stumped...:o :D
 
Nicodeamus said:
no 2d implies that there are two axis. (in reality a line or even a point cannot be in dimension as it always has a width.) However we use lines to represent dimension.

In engineering for example, forces are resolved to their x, y and z dimension. Then they are added in 1 dimension each and then the final resultant is found in 3d.

You use 1 dimensional analysis to solve a 3d problem.

you can also use a number line (getalle lyn, )

1 2 3 4 5 6 7 8 9 10.....

this is a basic form of a 1d graph, it proves that 10 is bigger than 1.
1d graphs are quite useless to be honest. They can be better represented with a 2d graph, but it doesn't mean that they do not have a use at all.
Click to expand...

All the 2nd axis does is gives a means of differentiating data points in a set manner. Which colour does as well. So it's 2d, just not traditional 2d. The amount of data represented by your colour graph is identical to what is represente by the 2 axis graph.
 
Sinbad said:
All the 2nd axis does is gives a means of differentiating data points in a set manner. Which colour does as well. So it's 2d, just not traditional 2d. The amount of data represented by your colour graph is identical to what is represente by the 2 axis graph.
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no man, by that reasoning a 2d graph would be 3d and a 3d would be 4d. I also use colour to differentiate in 2 dimensions, or we use labels. They do not add another dimension. You can draw all of them over each other in the same colour too if you wanted to, but you won't be able to see a thing. We use colour to help our minds differentiate.
 
No, a 3rd graph would be an additional point in the 2nd dimension... ;)

The minute you added an additional data point you added the second dimension. Adding more data points extends that dimension.

Think of it this way. You drew the graphs above each other, right? So there are both x and y coordinates there. 2 dimensional. Drawing a third graph above them is another set of x and y. Still 2 dimensions.
 
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For some or other reason I recall using colour as a second dimension at school. Not sure if this is a false memory based on the discussion but it certainly rings a bell. And for some reason I keep thinking back to automating drawings in Logo during computer class. Do they still teach Logo at schools?
 
Dj you are right.

The data set would be for example
Red:5
Blue:7
Green:10

Definitely a 2 dimensional coordinate system.
 
Sinbad said:
No, a 3rd graph would be an additional point in the 2nd dimension... ;)

The minute you added an additional data point you added the second dimension. Adding more data points extends that dimension.

Think of it this way. You drew the graphs above each other, right? So there are both x and y coordinates there. 2 dimensional. Drawing a third graph above them is another set of x and y. Still 2 dimensions.
Click to expand...

I was always taught that a motion graph would be 1 dimensional, as the axis only expands in 1d. But if you want to add colour as a 2nd dimension then that just depends on what you define as a 2nd dimension.
 
DJ... said:
For some or other reason I recall using colour as a second dimension at school. Not sure if this is a false memory based on the discussion but it certainly rings a bell. And for some reason I keep thinking back to automating drawings in Logo during computer class. Do they still teach Logo at schools?
Click to expand...

Unless you know that Afrikaans name then I might have to answer no, but I wrote matric 5 years ago.
 
Nicodeamus said:
I was always taught that a motion graph would be 1 dimensional, as the axis only expands in 1d. But if you want to add colour as a 2nd dimension then that just depends on what you define as a 2nd dimension.
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Colour is a mathematical standard, so can certainly be used as a 2nd dimension on that basis...
 
saksakgp said:
This is now a maths literacy lesson and it's interesting. Now I see why maths lit is important
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Yeah. How to draw a straight line and make it sound intelligent. 50% to all who contributed. 100% if you got the spelling of your own name right...
 
Nicodeamus said:
no man, by that reasoning a 2d graph would be 3d and a 3d would be 4d. I also use colour to differentiate in 2 dimensions, or we use labels. They do not add another dimension. You can draw all of them over each other in the same colour too if you wanted to, but you won't be able to see a thing. We use colour to help our minds differentiate.
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You would normally term that adding a second series to a graph.
 
Sinbad said:
Repeat 4 [fd 40 rt 90 ]
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The concepts of brackets in this program was a throwback to what we were learning in maths at the time as well. The concept of angles, geometry. I recall my final exam being 25% maths, 25% logo knowledge, 25% vision, and 25% fscking around. Was good fun...
 
Interesting. I've used colour as a 3rd dimension before.

X and Y coordinates and then a colour to determine the Z coordinates but then it isn't functioning as a labelling system the colour actually relates to a value scale.

So blue would be 0 and red would be 10 with a colour gradient in between.

3D but represented on just an X and Y axis obviously because your Z axis is just visualised using colours.

Thanks Nicodeamus and co for another interesting lesson :)
 
DJ... said:
You never used the turtle program? What has happened to the kids of today? :(

:D
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That is probably because I never did IT, the prospect of studying biology while being the only one of 2 guys in the class were more exciting at the time than playing counter-strike.
 
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