Graphics Programs Reference
In-Depth Information
To plot
x
2
+
x
+
1 on the interval from
−
2 to 2 we first make a list
X
of
x
values, and then type
plot(X, X.ˆ2+X+1)
. We need to use enough
x
values to ensure that the resulting graph drawn by “connecting the dots”
looks smooth. We'll use an increment of 0
.
1. Thus a recipe for graphing the
parabola is
>> X = -2:0.1:2;
>> plot(X, X.ˆ2+X+1)
The result appears in Figure 2-6. Note that we used a semicolon to suppress
printing of the 41-element vector
X
. Note also that the command
>> plot(X, f1(X))
would produce the same results (
f1
is defined earlier in the section
User-
Defined Functions
).
7
6
5
4
3
2
1
0
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
Figure2-6
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