how to remove values below 0.1?

after doing a series of calculations I obtained a prob(i)=1x27331 double matrix characterized by values ranging from 0 to about 0.4.

How can I remove all points with values less than 0.1 and change them to NaN?

I need these values below 0.1 to become worthless so that when plotting them they are not marked.

i tried with :

old = lt(prob(i),0.1);

new = NaN;

prob(i) = changem(prob(i),new,old);

...but it doesn't work.

Can anyone help me?

thanksss

Answer 1

[KSSV]

If P is your array if size 1x27331.

P(P<0.1) = NaN ; 

[ELISABETTA BILLOTTA]

it gives me an error .. it creates me a matrix made only of values = NaN and also deletes all the values greater than 0.1 that I need to make the graph with countourf

[KSSV]

Do you have a vector or a matrix?

It should not show error, Show us your data.

[ELISABETTA BILLOTTA]

ok it works!!! thanks a lot

Answer 2

[Chunru]

a = 0.4*rand(100,1);   % generate some data
a(a<0.1) = nan

a = 100×1

0.1696 0.3018 0.1866 0.2110 NaN 0.3823 0.1434 0.3446 0.3606 0.3845

[ELISABETTA BILLOTTA]

it gives me an error .. it creates me a matrix made only of values = NaN and also deletes all the values greater than 0.1 that I need to make the graph with countourf

[Chunru]

Are you sure you use the same code?