deleting columns that contains 0,1 and negative numbers

I have a large file, i want to delete the colums that contain 0,1 or negative values. I am new in matlab, any help will be appreciated. thank you. Until now. i tried to write the following lines to execute the file but it is not working

 f1=readtable('test1.csv');  %Read file 1
 d1=table2array(f1);
 d1(:,1)=[] % removing the first column as it is empty
 d1(d1(:,1)<0,:)=[] % removing the columns that are less than 0

Answer 1

[Walter Roberson]

d1 = readmatrix('test1.csv');
d1 = d1(:,2:end);    %removing the first column as it is empty
mask = all(d1 <= 0 || d1 == 1,1);
d1(:,mask) = [];    %remove columns that contain only 0, 1, or negative values

[Minions]

thank you so much for the solution, i was able to run the code, by changing || into &. but when i tried to save the new file, it still shows me the columns with 0,1 and negative numbers. I donno why this is happening. following is the code

d1 = readmatrix('test1.csv');
d1 = d1(:,2:end);    %removing the first column as it is empty
mask = all(d1 <= 0  & d1 == 1,1);
d1(:,mask) = [];    %remove columns that contain only 0, 1, or negative values
 csvwrite('new_file.csv',d1)

[Walter Roberson]

mask = all(d1 <= 0  | d1 == 1,1);

[Minions]

thank you so much for your reply, but can you explain me how does the mask function work?

[Walter Roberson]

mask is not a function, it is a variable here. It is being assigned the result of running all() over the first dimension of the result of the expression inside the all() call. The expression tests each entry in d1 for non-positive, and tests each entry for being exactly 1, and "or" the two results together. The result of the expression will be true for each location in d1 that is non-positive or is exactly 0, and false for each location that is positive but not exactly 0.

When you use all() over the first dimension of that array of logical values, you will get true for every column in which every value is either non-positive or exactly 1, and you will get false if there is even a single entry in the column that is positive but not exactly 1.

Once you have that vector of values, it is used for "logical indexing": any column with a true value is to be selected for deletion in the = [] statement.

Question: do you have any values that are positive greater than 0 but less than 1 and which you wish to leave alone? If so then the current code is needed; but if you do not have any such values, then you could potentially simplify the test to be d1 <= 1

[Minions]

I understand, thank you fro explaining it briefly.