inserting values in between two successive values in an array

I have an array 10X1

-7.55

-7.62

-7.59

-7.75

-7.78

-7.69

-7.63

-7.69

-7.58

-7.95

Now, i want to insert values in between two successive values as (-7.585) in between ( -7.55 -7.62) and so on, so that my array become 19X1.

Answer 1

[Rik]

This should get the job done:

data=[-7.55;-7.62;-7.59;-7.75;-7.78;-7.69;-7.63;-7.69;-7.58;-7.95];
newdata=interp1(...
    1:numel(data),...     create x values
    data,...              treat the data as y values
    1:0.5:numel(data),... create the new x values to sample
    'linear'); %          force the use of a linear interpolation
disp(newdata)

   -7.5500   -7.5850   -7.6200   -7.6050   -7.5900   -7.6700   -7.7500   -7.7650   -7.7800   -7.7350   -7.6900   -7.6600   -7.6300   -7.6600   -7.6900   -7.6350   -7.5800   -7.7650   -7.9500

[Mohammed Yousuf]

It is working thank you, If i want to get one more value after the 10th value, What should I do, Please help

[Rik]

What exactly do you mean by 'after the 10th value'? Do you want to extrapolate after the array you have? If you want that, you will have to find the pattern in your numbers.

plot(data)

I don't see any pattern. Can you predict what value should be at x=10.5?

[Mohammed Yousuf]

oK. I understood, thanks for your answer.