ECG plot in a textfile

[samson]

I like the ECG to be saved to a text file. I have an hardware to get the ECG , i will get the values I need to plot it using applet then to show it using and save it to a text file ?
Can I get this ???

[goldhouse]

Look at this , Tell me if this is what you needed ?
How can i display a line graph.. just like real time

[henna]

i have a same query..
i have ecg data stored in a text file, and i am plotting that data in jframe....
ecg data is as follows:

time volts
0.003 -0.145
0.006 -0.145
0.008 -0.145
...my entire data is getting plot as a straight line......even if i take a ecg signal of 60 minutes the voltage values are in decimals and are very less and they vary with time also very less...
i should be able to see the depths of d diagram.....there is where a noisy ECG signal lies...
can anyone plz help me....thanks in advance..:-)

[Norm]

You need to show the code that is drawing the graph

[henna]

Norm,..

public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASIN G,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.translate(0, getHeight() - 100);
g2.scale(1, -1);
g2.setPaint(Color.green.darker());

int i=0;
for(; i < a2.length-1;)
{

double x1 = a1[i];
double y1 = a2[i];
double x2 = a1[i+1];
double y2 = a2[i+1];
i=i+2;
g2.draw(new Line2D.Double(x1, y1, x2, y2));
}
}

//where a1[] and a2[]are the arrays where time and voltage values are stored....

[Norm]

What are the values of x1, x2, y1 and y2?
How are they computed?

[henna]

x-axis values are time values...and y-axis values are voltage values..as i showed previously...:
time volts
0.003 -0.145
0.006 -0.145
0.008 -0.145
and they change very slowly...i mean voltage changes very slightly over a period of time.....


i do not calculate as uch....directly plot the points..................

but norm...i think u gave me an idea!!...should i calculate the values.. imean anything like 0.1=1+0.1....so that the graph becomes visible...??..

[Norm]

Add a println to print out the values of x1, x2, y1, y2 so you can see what the code is trying to draw.

[henna]

i had added....i saw..its all right values ...exactly whatever the file has...!...
i just removed it while showing it to u...
my question is:
it plots d graph...but as the values are very very less it gives a straight line on the output screen.....................
and i want to see orignal graph..as in make the graph more visible......
ie...as it would be in case of integer values..

[Norm]

You probably have to scale the data to make the graph you want to see.
What is the range of the y values? What is the vertical size of the graph you want to plot?
How many pixels per unit of data? For example what is the different in y value for .12 and .13?

[henna]

the range of y values is from -0.100 to say -0.700.........whereas x values vary from 0.0 t0 60.0...
iam new to java...
i dint understand what u meant by "How many pixels per unit of data? For example what is the different in y value for .12 and .13?"

[Norm]

The size of the graph you are drawing is measured in pixels. My console is 1400 wide by 900 high.
If I want to plot data that is in the range of .1 to .7 then I have to scale it to my screen.
The max-min(delta) is .6. If I want to use 600 pixels vertically for the graph then I can show each .1 change in value by a 100 pixel change.
A .1 value would plot at y=600, a .7 value at y=0

[henna]

heyy!!...it got plotted...i directly scaled d values..
something like this:
x1=x1*100
y1=y1*100....
yeah!!...i can c d ecg wave!!

[DarrylBurke]

i have a same query..

In future, don't resurrect an old dead thread. Ask your question in a new thread -- they're free.

.i can c d ecg wave!!

This is a technical forum. Please use proper words.

db