how to create a for loop for 3 variables

%how can I reiteratively create a foor loop for the following:

Number1 = Point(1:15*7);

Number2 = Point(1+15*7 : 2*15*7);

Number3 = Point(1+2*(15*7) : 3*(15*7);

Answer 1

[the cyclist]

% Make up a random input. (You don't need this step)
Point = rand(1,3*15*7);

% Define these parameters for convenience
NR = 3;
NC = 15*7;

% Initialize the output array
Number = zeros(NR,NC);

% Fill the array
for n = 1:NR
    Number(n,:) = Point((n-1)*NC+1:n*NC);
end

Each variable you have called Number1, etc, is a row of Number. It is better to not use dynamically named variables.

[the cyclist]

Note that one can also use the reshape function to do a similar manipulation, but it wasn't clear to me that this is really what you intended.

[Michael Angeles]

Thank you, but how can I save the array for each variable?

[the cyclist]

You should not do this. Read why here.

Anywhere that you would have used Number1, use Number(1,:) instead, and it should work.

[Michael Angeles]

I needed each "Number 1-3" as a separate variable in the workspace. Each one will be used by another part of the code.

[the cyclist]

Number1 = Number(1,:);

[Stephen23]

"I needed each "Number 1-3" as a separate variable in the workspace."

I doubt that you "needed" that.

"Each one will be used by another part of the code."

Using indexing is the easist way of achieving that.

[the cyclist]

100% agree with @Stephen, even though I finally caved in a told you how to do what you asked for.

I strongly suggest you read the info I provided on why it's a bad idea to name variables Number1, Number2, etc.

[Michael Angeles]

the cyclist - that worked....thanks!!

Answer 2

[DGM]

This probably isn't exactly what you want, but I'm not sure what you're working with, and the approach can probably be improved. Consider this a suggestion more than a complete answer.

A few points:

• I don't know what Point is. I'm going to assume it's a vector and that it's integer-divisible by 105
• Embedding indexing information in variable names is counterproductive. Avoid that in favor of using array indexing or something
• Use meaningful variable names. Calling a numeric variable "Number" conveys no information.

% i assume that numel(Point) is integer-divisible by 105
Point = 1:315;

% now each row of Point is what you would have called NumberX
Point = reshape(Point,105,[]).';

% say those are x,y,z components of a point list
plot3(Point(1,:),Point(2,:),Point(3,:)); grid on

If Point is not necessarily integer-divisible by the assumed row length and any excess is to be ignored, you can simply truncate the length of the vector before reshaping it.

rl = 105; % row length
Point = 1:320; % not integer-divisible by row length
Point = Point(1:rl*floor(numel(Point)/rl)); % truncate

Again, it's hard to know what you're after. I'm assuming you're intending to generalize for more than 3 rows.