Lectures 6 - 11

Question 1

What is the generic code for an unconditional loop?

Answer 1

for loopvarname=m:s:n
statements
end

Question 2

What is another name for unconditional loops?

Answer 2

For loops

Question 3

What is another name for conditional loops?

Answer 3

while loops

Question 4

What is the generic code for while loops

Answer 4

while (logical expressions)
statements
end

Question 5

What are the criteria for while loops

Answer 5

logical expression must have a defined variable prior to the while statement
it must be updated with each iteration

Question 6

What creates a 3D plot?

Answer 6

surf(x,y,z)

Question 7

2D logarithmic x linear y

Answer 7

semilogx(x,y)

Question 8

2D logarithmic y linear x

Answer 8

semilogy(x,y)

Question 9

2D logarithmic x and y

Answer 9

loglog(x,y)

Question 10

2D polar plot of theta and r

Answer 10

polar(th,r)

Question 11

axis square

Answer 11

makes the plot area square

Question 12

axis equal

Answer 12

sets the plot area with proportional axes (equal unit lengths)

Question 13

axis normal

Answer 13

returns axes to default settings

Question 14

grid on/grid off

Answer 14

turns on and of griddlines

Question 15

hold on/hold off

Answer 15

freezes contents of plot area for adding other data series (lets you plot multiple data series on same figure)

Question 16

Describe these line types

solid, dashed, dashed dot, dotted

Answer 16

-.
:

Question 17

describe these color types

black blue red green cyan magenta yellow white

Answer 17

k black
b blue
r red
g green
c cyan
m magenta
y yellow
w white

Question 18

Describe these symbol types

dot asterisk x cross circle upright triangle inverted triangle square diamond 5 point star

Answer 18

. dot
* asterisk
X x
\+ cross
o circle
^ upright triangle
V inverted trianlge
s square
d diamond
p 5-point star

Question 19

Puts a text string on the current plot with coordinates (x,y)

Answer 19

text(x,y,’my text’)

Question 20

Puts a text string on the plot where the user clocks the arrow

Answer 20

gtext(‘my text’)

Question 21

What are the basic types of mathematical models?

Answer 21

linear
power law
exponential
logarithmic

Question 22

Matlab command that fits a polynomial of order n to data stored in vectors x,y. What does it also perform?

Answer 22

[p,s]=polyfit(x,y,n)

performs a least-squares method to obtain polynomial curvfits

Question 23

What characterizes a perfect fit?

Answer 23

J = 0 (dimensional) and R^2 = 1 (dimensionless)