Store answers in multiple variables?

Hello,

I have a variable B which outputs about 100 cells. Assuming N = 4, how do I go about obtaining cell2mat(B(N(1)) in a new variable x_1, cell2mat(B(N(2)) in x_2, and so forth? Currently I am using:

for cnt = 1:N
hold on;
x = cell2mat(B(cnt));
end

Thanks in advance!

-- Jake

[Daniel Shub]

In general, you probably do not want to be doing this. Why do you want x1, x2, ... It is only going to lead to evil eval statements later.

[Jake Bolanski]

On a separate note, is there a function in MatLab that will allow me to detect colors within an image? I have broken down the image into a matrix via the imread() function. How can I go about detecting whether the leaf detected is green or yellow or so on? Thanks in advance.

Answer 1

[Fangjun Jiang]

"hold on" is for graphics. It has nothing to do your operation.

Depending on your cell array B, you may not need cell2mat. See this example:

B={rand(2),magic(2),rand(3),magic(3),rand(4),magic(4)};
[x1,x2,x3,x4]=B{2:5}

[Jake Bolanski]

Thanks for the reply. Hold on is there because there is a plot - i simply excluded the code from the question.

I think I was somewhat unclear in my question. What I want to do is this:

Say I have N = 10 but I do not know that N is 10 as it changes from 1 to whatever.

I want to make a new variable for every value of N automatically. Hence, I want it such that x1 = 1, x2 = 2, x3 = 3, ... xN = N. Since I do not know what N is, I cannot do [x1,x2,x3,...,xN].

How can I go about this? I assume I need a loop but cannot figure out how to set up one.

Thanks in advance.

[Fangjun Jiang]

Don't do that. That is a really bad programming. You'll find that is a trap. See http://www.mathworks.com/matlabcentral/answers/143-how-do-i-make-a-series-of-variables-a1-a2-a3-a10

[Fangjun Jiang]

And this http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

[Jake Bolanski]

Wow, very very very helpful! Thanks a bunch! :D