plot graph

i need to get data from file "data.txt" and then plot two graph.one graph using the first column and value after 174=XXX, another graph using second column and value 174=XXX. Since my data is very big, so i hv two text box to let user select what data needed to plot in graph.

For example: if value textbox1=3.8566300, textbox2=100.81888000
i need to get data from (3.8566300 -0.0001) to (3.8566300+0.0001)
From (100.81888-0.0001) to (100.81888+0.0001)
and then plot the graph.

Format in "data.txt"
3.85663000 100.81888000 174=0
3.85625000 100.81778000 174=0
3.85519000 100.80883000 174=0
3.85425000 100.80501000 174=0
3.85252000 100.80040000 174=0
3.84993000 100.79627000 174=0
3.84648000 100.79283000 174=0
3.83853000 100.78786000 174=0
3.83705000 100.78591000 174=0
3.83669000 100.78409000 174=0
3.83646000 100.77324000 174=0

Sounds like homework, which we don't do here.

However, if you have a specific question, we can help you with that.

I wrote a little trig graphing utility back in high school. Probably still have it lying around somewhere...

Inputting from a text file isn't too difficult. Plotting a graph is even easier. What do you need help with?

i hv a file which hv the value for axis-x,y,z. how to get value(in blue color) from the data file and then plot graph

Below is the example format data file:
3.85663000 100.81888000 174=0
3.85625000 100.81778000 174=0
3.85519000 100.80883000 174=0
3.85425000 100.80501000 174=0
3.85252000 100.80040000 174=2
3.84993000 100.79627000 174=2
3.84648000 100.79283000 174=2
3.83853000 100.78786000 174=2
3.83705000 100.78591000 174=5
3.83669000 100.78409000 174=5
3.83646000 100.77324000 174=5
3.83802000 100.75919000 174=5
3.83759000 100.75577000 174=10
3.83763000 100.74733000 174=10
3.83861000 100.74441000 174=10
3.84473000 100.73100000 174=20
3.84684000 100.72718000 174=20
3.84955000 100.72392000 174=30
3.85680000 100.71816000 174=100

"column1 =axis-x,column2=axis-z,column3=axis-y"

Duplicate threads merged.

Do not create new threads for the same question.