adding strings per component
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Hi,
I have the following code:
for n = 1:4
velocity = ['v_',num2str(n),' = n*2'];
eval(velocity)
position = ['x_', num2str(n), '= n.^2'];
eval(position)
end
So, the expected output would be: v_1 = 2, x_1 = 1 \\ v_2 = 4, x_2 = 4 \\ … \\ v_4 = 8, x_4 = 16.
Let's say we want to do something to the components. For example, add v_1 + x_1, (we want to do something to variables with the same index.) How do we do that?
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Azzi Abdelmalek
2014-11-29
0 个投票
This is not a good idea, read this http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F
6 个评论
cgo
2014-11-29
Azzi Abdelmalek
2014-11-29
编辑：Azzi Abdelmalek
2014-11-29
The alternative is to work with arrays, or cell arrays. In your case:
s(:,1)=(1:4)'*2
s(:,2)=(1:4)'.^2
The first column represent the velocity and the second represent the position. Why to create a name for each value when you can use just one? Then if you want to sum velocity and position
out=sum(s,2)
cgo
2014-11-29
per isakson
2014-11-29
... or two structures called, e.g.  velocitiy  and  position
for n = 1:4
velocity.( sprintf('v_%d', n ) ) = n*2;
position.( sprintf('x_%d', n ) ) = n.^2;
end
This is a good alternative when the names of the fields carry valuable information on the code, but maybe not this time.
Azzi Abdelmalek
2014-11-29
velocity=s(:,1);
position=s(:,2);
out=table(velocity,position)
cgo
2014-11-29
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