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how do i save looped output into 1 variable matrix

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c=19;
>> D=[];
>> for k=1:c;
Z=[X(:,1),Y(:,1)];
p=anova1(Z)
D=save(p)
X(:,1)=[];Y(:,1)=[];
end

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john borsellino
john borsellino on 10 May 2013
Ok then, So… I have (2) 3 x19 matrices, A and B I want to perform anova1 on the first 3 elements of A and the first 3 elements in B Then I need to save individual results into a 3rd matrix that aligns with A and B(if possible) This is what I have so far…
G= 19 % loop count For k= 1:g C=[A(:,1),B(:,1)] % combines 1st column from A with 1st column from B P=anova1(C) % performs anova on “C” and displays answer A(:,1)=[], B(:,1)=[] % removes 1st column from A and B and moves next column into loop end
I think I need to pre-allocate an empty matrix(1x19) to hold the answers as a group and in order, but I can’t find it in the manuals…thanks for your input and time…i have 8 weeks in matlab...be gentle
john borsellino
john borsellino on 10 May 2013
"save" to store the result of an applied function...in this case i get 19 individual results...(that need to be stored or saved together as a group) "1 individual matrix"== all 19 answers saved together in a new "vertex" or a 1x19 matrix...sorry still learning the jargon

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Accepted Answer

James Kristoff
James Kristoff on 13 May 2013
% X and Y are 3x19 matricies
%
% This syntax makes sure that if you end up having more (or less) columns
% in the future, you don't need to change the code
numColumns = size(X, 2);
% Pre-allocate for speed (create a 1 x numColumns vector)
p = zeros(1, numColumns);
% I used length(p) here to signal the intent that the loop is meant for
% modifying the vector p
for k = 1:length(p);
% using the loop variable *k* means that MATLAB will use a different
% column from X and Y to create Z for each loop
Z=[X(:,k),Y(:,k)];
% this will store the resulting value in the k-th position in the vector
% *p*
p(k)=anova1(Z);
end

  2 Comments

john borsellino
john borsellino on 14 May 2013
this works...thankyou...can you tell why matlab seperates my identifier column and row of column headers from the data...and how to put them back together...with a new column of data...i have G= [A,B,Z] %%which puts the data columns and the answer column together..
john borsellino
john borsellino on 16 May 2013
the anova1() function displays a table and chart, along with the p-value,the manual says that i can turn this display off,but it doesn't say how... can you rewrite the p(k)= anova1(Z)....i've tried p(k)= anova1(Z, ,'off'),...=anova1(Z,'off')...idk what to do...what am i not getting?

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More Answers (1)

bym
bym on 9 May 2013
c=19;
% D=[];
p = zeros(c,1); % preallocate
for k=1:c;
Z=[X(:,1),Y(:,1)];
p(k)=anova1(Z);
%D=save(p) unecessary
%X(:,1)=[];Y(:,1)=[]; don't change X or Y!
end

  2 Comments

john borsellino
john borsellino on 10 May 2013
but if i don't remove the cloumns from X and Y won't i just get the same answer 19 times...how do i tell matlab to move to the next set of elements in A and B???
john borsellino
john borsellino on 10 May 2013
...and thanks for your input and time...only 8 weeks on matlab...be gentle

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