MATLAB: How to do loop in the Workspace

loopmeanworkspace

I have four matrixes c1 c2 c3 c4 (each matrix is 45×9)in the workspace. I need to calculate the mean for each row in each matrix.

The code I tried does not work:

c = {c1, c2, c3, c4};
for j = 1:4
    mean_c(j) = mean(c{j},2);
end

Best Answer

Method One: for loop:

c = {rand(45,9), rand(45,9), rand(45,9), rand(45,9)};
d = cell(size(c));
for k = 1:numel(c)
   d{k} = mean(c{k},2);
end

Method Two: cellfun:

 d = cellfun(@(m)mean(m,2),c,'UniformOutput',false);

Convert to numeric by simply using cell2mat:

>> cell2mat(d)
ans =
 0.49524   0.40269   0.65561   0.47278
 0.59244   0.52532   0.41187   0.42431
 0.34457   0.58936   0.54098   0.55274
 0.52958   0.62364   0.50265   0.52148
 0.70699   0.65555   0.58959   0.48702
 0.38250   0.34663   0.54874   0.48712
 0.59373   0.44404   0.62564   0.39276
 0.48016   0.59843   0.57385   0.48644
 0.49235   0.52315   0.52946   0.53855
 0.51168   0.69419   0.46208   0.35696
 0.53927   0.46378   0.48168   0.49156
etc

Related Solutions

MATLAB: How to write this below IF condition in MATLAB

So what exactly do you have? I don't know if you have an array or a table. To get c1,c2,c3, and c4 from a table you do

c1 = t.c1;
c2 = t.c2;
c3 = t.c3;
c4 = t.c4;

To get c1,c2,c3, and c4 from an array you do

c1 = c(:, 1);
c2 = c(:, 2);
c3 = c(:, 3);
c4 = c(:, 4);

Then to do

IF(AND(C1>C2,C1>C3,C1>C4),1,IF(AND(C2>C1,C2>C3,C2>C4),2,IF(AND(C3>C1,C3>C2,C3>C4),3,4)))

you need to specify whether you want that done on a row by row basis , or if all elements (all rows) in something like C1>C2 need to be true. Which is it?

MATLAB: Solve symbol four equations for c1 c2 c3 c4

Thanks, I solve it,

clc
clear
syms a b x y c1 c2 c3 c4 T1 T2 T3 T4  
T=c1+c2*x+c3*y+c4*x*y;
%%
r1=c1+c2*a+c3*b+c4*a*b-T1;
r2=c1-c2*a+c3*b-c4*a*b-T2;
r3=c1-c2*a-c3*b+c4*a*b-T3;
r4=c1+c2*a-c3*b-c4*a*b-T4;
%%Find C1 and C4
p13=r1+r3;
p24=r2+r4;
n1=solve(p13==0,c1);
n2=solve(p24==0,c1);
C4=solve(n1==n2,c4)
w1=solve(p13==0,c4);
w2=solve(p24==0,c4);
C1=solve(w1==w2,c1)
r1=subs(r1,c1,C1);
r1=subs(r1,c4,C4);
r2=subs(r2,c1,C1);
r2=subs(r2,c4,C4);
r3=subs(r3,c1,C1);
r3=subs(r3,c4,C4);
r4=subs(r4,c1,C1);
r4=subs(r4,c4,C4);
%%Find C3
q12=r1+r2;
q34=r3+r4;
C3=solve(q12==0,c3)
r1=subs(r1,c3,C3);
r2=subs(r2,c3,C3);
r3=subs(r3,c3,C3);
r4=subs(r4,c3,C3);
%% find C2
C2=solve(r1==0,c2)
r1=subs(r1,c2,C2);
r2=subs(r2,c2,C2);
r3=subs(r3,c2,C2);
r4=subs(r4,c2,C2);
C1
C2
C3
C4

Best Answer

Related Solutions

MATLAB: How to write this below IF condition in MATLAB

MATLAB: Solve symbol four equations for c1 c2 c3 c4

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