How can I plot the vector for specified node?

2012 9 16
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I am using following command
quiver(xarray(1:4:end),yarray(1:4:end),DV_XX(1:4:end),DV_YY(1:4:end),1, 'k','filled');
which is plotting the vector for every node. I want to plot for every alternate node that means it will plot 1st node then do not plot arrow for 2nd node the again plot the arrow for 3 rd node.
Any idea how can I do that?

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Walter Roberson
Walter Roberson 2012-9-16

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XX_t = DV_XX(1:4:end);
XX_t(2:2:end) = NaN;
and plot with XX_t instead of DV_XX(1:4:end)

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Tan Has
Tan Has 2012-9-16
THIS IS WORK FOR ME
XX_t = DV_XX(1:4:end);
XX_t(3:3:end) = NaN;
YY_t =DV_YY(1:4:end);
YY_t(2:3:end) = NaN;
quiver(xarray(1:4:end),yarray(1:4:end),XX_t,YY_t,1, 'k','filled');
BUT THE NAN VALUE IS PLOT AS A DOT IN THE FIGURE. I DON'T WANT TO SHOW THAT. HOW CAN I DO THAT.

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