回复： capture data using mouse

[nonmm]

Hi,

i have plot a graph using plot(w,block1);

am i able to get the data using "ginput" ?

[Wu] = ginput;

Tu1=2*pi/Wu(1);

[ttrr]

Yes, you can do that.

MathScript supports the command of ginput. Below are the syntax and description of ginput.
[x, y] = ginput
[x, y] = ginput(n)
[x, y, b] = ginput
[x, y, b] = ginput(n)
Acquires data points from the current plot by a mouse click. [x, y] = ginput acquires data points until you press the <Enter> key. [x, y] = ginput(n) acquires data points until LabVIEW acquires n data points or until you press the <Enter> key.

Note that if you only specify one output, ginput only returns the x-coordinates of the data points acquired. Moreover, ginput will stop execution of MathScript until you press the <Enter> key to step acquiring.

[nonmm]

i have done ask what you have told me, but it doesn't seem to capture my data.

[ttrr]

If you want the value of Tu1, you must explicitly change the data type of the output Tu1 as DBL scalar.

Also note that ginput only works for the plot window generated by MathScript Window or Node. It does not work on native LabVIEW XY Graph control.

[nonmm]

oh i see. so for labview part, the cursor can't be done completely?

[ttrr]

Open the attached VI. Move the cursor to verify the value of cursor point.

By the way, what do you really want to do?

[nonmm]

i wish to capture data from the graph and use the data for calculation. do version 6.2 have graph cursor?

[ttrr]

I have not tried version 6.2. But, I think it should have cursor.

[nonmm]

i cant seem to open ur file.

[ttrr]

I re-attach the VI.