is bulid in dwt function of matlab round the result? if so,is there any way to change that?

due to rounding i am losing some value.can i compensate it in any way?

Answer 1

[Walter Roberson]

Give the command

format long g

and then look at your results again. Do you still observe the "rounding" ?

[anika hossain]

yes. i think

[ca,ch,cv,cd]=dwt2(a,'mode');

this build in function has rounding by default. is it possible?

[Walter Roberson]

Please show an example of the rounding you observe and the value you expect.

[anika hossain]

it makes .65 to 1,-.35 to 0 and many more. the most changing value is 0,after that small negative numbers.u can easily understand for a image if it is destroying 0 value that is black,then i am in big trouble...

Answer 2

[Maram Sharahili]

use the built_in matlab function for the secant algorithm to find the root of x-2^-x on [0,1] accurate to within 10^-4

[Walter Roberson]

Please start a new Question for that.