My computer
studies started with a short introduction of computer history and a programming
language-DrRocket. DrRocket is designed for different people regards to their
experiences with computer language, and it has language for beginning student,
intermediate student and advanced student. As a student who is not really
familiar with programming, I am using intermediate student with lambda.
To deal with
pictures, (require picturing-programs) should always be written in the first
line. Below are many functions that can be used in terms of manipulating
images:
(flip-vertical
im)
(flip-horizontal
im)
(rotate
180 im)
(rotate-cw
im)
(rotate-ccw
im)
(scale
3 im)
(scale/xy
3 1/3 im)
(image-width
im)
(image-height
im)
(crop-top
im 100)
(crop-left
im 100 )
(beside
im1 im2)
(above
im1 im2)
(overlay
im1 im2)
I also learned about how to build a image:
(circle size “solid” “color”)
In addition, there are other functions that related with numbers and
strings:
(quotation 5 3)
(reminder
5 3)
(+
½ ¾ 1 4 7)
(/
1 6 3/5 3 6)
(round
e)
(floor
e)
(inexact->exact
#i3.0)
(numerator
-2.55)
(denominator
-2.55)
(string-length
“2245778”)
(string-append
“all” “together”)
(substring
“123567” 3 6)
