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New to j2se 5.0

According to Oracle's documentation, the log10 method became part of Java with the release of J2SE 5.0. Therefore, this code is notcompatible with earlier versions of Java.

Here are a couple of restrictions taken from Oracle's documentation that apply to the use of the method named log10 :

  • If the argument is NaN or less than zero, then the result is NaN.
  • If the argument is positive zero or negative zero, then the result is negative infinity.

Because of the first restriction, the code in Listing 7 converts all negative values into positive values before performing the conversion. Because of thesecond restriction, no attempt is made to compute the log of elevation values of zero.

Otherwise, the code in Listing 7 is straightforward and should not require further explanation.

Normalize the surface elevation data

After converting the elevation data to log form, (or not converting as the case may be) , the code in Listing 8 calls the method named scaleTheSurfaceData to normalize the elevation data by squeezing it into the integer range between 0and 255 inclusive. When this method returns, the lowest elevation has a value of 0 and the highest elevation has a value of 255.

Listing 8. Normalize the surface elevation data.
scaleTheSurfaceData();

The elevation data is normalized to this range to make it easier later to form relationships between the elevation values and allowable color values.

(Recall that allowable color values range from 0 to 255.)

The method named scaleTheSurfaceData

At this point, we will take a side trip and examine the method named scaleTheSurfaceData , which is shown in its entirety in Listing 9 .

Listing 9. The method named scaleTheSurfaceData.
double min; double max;//This method is used to scale the surface data // to force it to fit in the range from 0 to// 255. void scaleTheSurfaceData(){//Find the minimum surface value. min = Double.MAX_VALUE;for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ if(data[row][col]<min) min = data[row][col];}//end col loop }//end row loop//Shift all values up or down to force new // minimum value to be 0.for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ data[row][col] = data[row][col] - min;}//end col loop }//end row loop//Now get the maximum value of the shifted// surface values max = -Double.MAX_VALUE;for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ if(data[row][col]>max) max = data[row][col];}//end col loop }//end row loop//Now scale all values to cause the new // maximum value to be 255.for(int row = 0;row<dataHeight;row++){ for(int col = 0;col<dataWidth;col++){ data[row][col] =data[row][col]* 255/max; }//end col loop}//end row loop }//end scaleTheSurfaceData

While this method is rather long, it is completely straightforward and shouldn't require further explanation.

Create an appropriate pair of Canvas objects

Return now to the discussion of the constructor for the ImgMod29 class.

Questions & Answers

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
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Bhagvanji
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Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
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narayan
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ya I also want to know the raman spectra
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Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
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Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Digital signal processing - dsp. OpenStax CNX. Jan 06, 2016 Download for free at https://legacy.cnx.org/content/col11642/1.38
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