Removing a Range of Elements from an array

Hi,

I have a matrix M and I am interested in the 12th column which has elements [1 2 3 4..... 540 589 760 761 770 47 46 47 48]

My goal is to get rid of all the elements after 750, including the values less than it.

My first code was

M(M(:,12)>750,:) =[]; 

but this didn't get rid of 47 46 48..

Mx= find(M(:,12)>750);
Mxmin=min(Mx); %to find the smallest value above 750 (in this case 760)
M(Mxmin:end,12)= [];

currently I am using this code, which gives me an error that says A null assignment can have only one non-colon index.

What am I doing wrong?

[Hans123]

I want to eliminate the whole row of that matrix, if the column 12 contains a 760 - I want that row removed. That's why I used [ ]

Answer 1

[Walter Roberson]

M(find(M:,12)>750,1):end, :) = [];

[Hans123]

wow!

Thank you, really appreciate it

Answer 2

[Jos (10584)]

ix  = find(M(:,12) > 750, 1, 'first') % find the row index of the first element in the 12th column of A being larger than 750
M(ix:end,:) = []  % remove all the rows of M starting with this row