How to use min function so that it stops at the first minimum value in a column matrix, stores values, and then continues going until it finishes the entire matrix? (details below)

would like to write a loop where i would like to sort through a column vector and stop when it hits a min value, these values would get stored in a subsequent array, then it keeps going until it hits another min value, and then these values would get stored in a subsequent array, and so on until it reaches and finishes the entire column vector. How would I go about doing this?

[SHIVAM KUMAR]

So do you want to find the minimum value of the array ?

[Sai Pamula]

Hi, thanks for your reply. So basically let’s say we have a column vector: 0.200 0.300 0.400 0.001 0.002 0.003 0.004 0.003 0.002 0.001

I need the code to run so it recognizes the first minimum value:0.001 and stores all values before it in one array. Then it continues till it finds the next minimum value:0.001. Then stores everything before it in another array

[Sai Pamula]

any ideas on how to go about solving this? I just need it in some way so I can easily plot all of these arrays on a graph

[Rik]

Is that minimum value guaranteed to be the same value? Or should the function determine a new minimum value?

Answer 1

[Rik]

If the minimum value you're after is the same throughout the array:

data=[0.200 0.300 0.400 0.001 0.002 0.003 0.004 0.003 0.002 0.001];
ind=find(ismember(data,min(data)));
ind=[0 ind];
ind_start=ind(1:(end-1))+1;
ind_end=  ind(2: end   )  ;
output=arrayfun(@(i1,i2) data(i1:i2),ind_start,ind_end,'UniformOutput',false);
celldisp(output)

 
output{1} =
 
    0.2000    0.3000    0.4000    0.0010

 
 
output{2} =
 
    0.0020    0.0030    0.0040    0.0030    0.0020    0.0010

 

Alternatively, if the minimum can change over the array:

output={};ind1=0;
data=[0.200 0.300 0.400 0.0001 0.002 0.003 0.004 0.003 0.002 0.001];
%                           ^ added a 0
while ind1<numel(data)
    ind1=ind1+1;
    [~,ind2]=min(data(ind1:end));
    ind2=ind1+ind2-1;
    output{end+1}=data(ind1:ind2); %#ok<SAGROW>
    ind1=ind2;
end
celldisp(output)

 
output{1} =
 
    0.2000    0.3000    0.4000    0.0001

 
 
output{2} =
 
    0.0020    0.0030    0.0040    0.0030    0.0020    0.0010

 

Answer 2

[Bruno Luong]

A=[0.200 0.300 0.400 0.001 0.002 0.003 0.004 0.003 0.002 0.001]

imin=find(A==min(A));
lgt=diff(union(imin,[0 length(A)]))
C=mat2cell(A,1,lgt);

Check (the min values are located at the end)

>> C{:}

ans =

    0.2000    0.3000    0.4000    0.0010


ans =

    0.0020    0.0030    0.0040    0.0030    0.0020    0.0010