MATLAB: Can two 201×1 arrays be added in matrix multiplication way to produce a 201×201 matrix

for loop

I'm having trouble creating a for loop nested in a for loop that allows me to add to single column arrays in a matrix multiplicative way. In other words take two 201×1 arrays add them in the way described below to produce a 201×201 matrix. Please help if you can.

And what I mean by a matrix multiplicative way is :.

A=[1
   2
   3
   4]
B=[A
   B
   C 
   D]
A+B=[1+A 2+A 3+A       ]
     1+B 2+B 3+B
     1+C 2+C 3+C
     1+D 2+D 3+D....

Best Answer

Take a look at bsxfun:

C = bsxfun(@plus, A, B')

Related Solutions

MATLAB: K=1;201;

As asked:

A variable named "k" is to be created. The variable is to be assigned a value. The value to be assigned is the list of numbers that is the single number 1. The ";" that follows that indicates that the result of the assignment is not to be displayed. That is the end of that bit of execution, and the rest of the line is evaluated separately. The value 201 is constructed, and as it is not used in any other way, its value is to be assigned to the default variable named "ans". The ";" that follows that indicates that the result of the assignment is not to be displayed.

But what you probably meant to ask about was

k=1:201;

with a ":" between the numbers instead of a ";". The meaning of that would be:

A variable named "k" is to be created. The variable is to be assigned a value. The value to be assigned is the list of numbers starting from 1, incrementing by 1, until the last number that is less than or equal to 201. The ';' means that the result of doing the assignment is not to be displayed.

Note that k=1:201; would have a different but related meaning if proceeded by the keyword "for", as in

for k=1:201;

MATLAB: Creating 3×201 matrix from set of numbers

Matt's answer is the most efficient. However since you mentioned you needed to do it specifically with for loops here's the code that will do it in a nested loop.. One thing I noticed in your loop was that your variable I was being overwritten by the latest value of i,j,k hence all you were seeing was the last value of i,j,k.

Matrix=zeros(201,3); 
for i=1:1:200
    for j=1:1:200
    for k=1:1:200
    I=i/10;
    Matrix(i+1,:)=I;
end
end
end

Best Answer

Related Solutions

MATLAB: K=1;201;

MATLAB: Creating 3×201 matrix from set of numbers

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