replace values in an array with certain numbers

I have an array (very long array) with values varying from 1 to 20 (with decimal values in between). What i want to do is the following:

if the values in my array are between 0 and 1, then replace with number 500;

if the values are between 1 and 2, then replace with 1000;

if the values are between 2 and 3, then replace with 1500;

..... and so on.

How could i do this, thanks in advance :)

Answer 1

[KSSV]

You can get the logical indices by using:

idx = A >=0 & A< 1 ;   % logical indices 
A(idx) = 500 ;   % repalces them 

Follow the same with others.

[Daniel Pollard]

This is likely the best way. It's probably possible to use a loop to avoid code getting too out of hand:

for val = 1:20
    idx = (A >= val-1) && (A < val);
    A(idx) = val*500;
end

[Fadel Raad]

both worked, thank you :)

Answer 2

[Steven Lord]

x = 2*rand(10, 1);
edges = 0:2;
d = discretize(x, edges, [500, 1000]);
results = table(x, d, 'VariableNames', ["Raw data", "Discretized value"])

results = 10x2 table
    Raw data    Discretized value
    ________    _________________

     0.69853           500       
      1.5357          1000       
     0.18276           500       
      1.2076          1000       
      1.5088          1000       
    0.030049           500       
    0.049193           500       
      1.3234          1000       
     0.23645           500       
      1.2114          1000       

[Fadel Raad]

efficient and simple! thanks