Graphics Programs Reference
In-Depth Information
>> eval(str)
v=
1
2
3
4
5
The
eval(str)
statement acts just as if we had typed
v = 1:5
at the
command line. To suppress the output we need to add a semicolon
character to the end of the string:
>> str = 'v = 1:5;'
str =
v = 1:5;
>> eval(str)
The
eval
command now produces no output, while still defining the
variable
v
. To take another example, let us suppose we want to define a
set of vectors
v
i
=1
,
2
,...i
for
i
=1
,
2
...
10. At the command line we
could type:
v1=1;
v2 = 1:2;
v3= 1:;
and so on. The
eval
command provides a neat solution:
>> clear
>> for i = 1:10
str = ['v' int2str(i) ' = 1:i;'];
eval(str)
end
This has generated the variables
v1
,
...
,
v10
, with the appropriate ele-
ments:
>> whos
Name
Size
Bytes Class
i
1x1
8 double array
str
1x10
20 char array
v1
1x1
8 double array
v10
1x10
80 double array
v2
1x2
16 double array
v31x3 24 double array
v4 1x4 32 double array
v5 1x5 40 double array
v6 1x6 48 double array
v7 1x7 56 double array
v8 1x8 64 double array
v9 1x9 72 double array
Grand total is 66 elements using 468 bytes
