How to Mapping Values

how to map values of (3 to 4) to (1.4 to 4)?

thanks.

[KSSV]

An example will help..what do you mean by map?

[Ramakrishna Bajaj]

I am reading values from the sensor and I am getting values from 3.3576 to 4.0811 not exactly approximately.

so I want to scale these values to 1.4 to 4. So that I can do comparison with my data.

Answer 1

[M]

Suppose you have :

x=[3.35 3.4 3.8 3.9 4 4.08];

and you want to scale it to the interval [a b]

a=1.4;
b=4;

you can do it like this :

y = (x-min(x))*(b-a)/(max(x)-min(x)) + a;
y =

    1.4000    1.5781    3.0027    3.3589    3.7151    4.0000

[Ramakrishna Bajaj]

what if I am not sure of min and max values? Then how should i deal with this and the values are changing real time.