Gökhan Sever wrote:
On Sun, Mar 21, 2010 at 1:57 PM, AG <computing.acco...@googlemail.com <mailto:computing.acco...@googlemail.com>> wrote:Hi List I cannot figure out how to satisfy this issue to resolve the ValueError: x and y must have same first dimension. This is the relevant code: [code] for i in range( 0, time + 1 ): outflow = constant * quantity quantityChange = inflow - outflow changeList.append( quantityChange ) print "%2d %9.2f %11.3f %11.3f %10.3f" % ( i, inflow, quantity, outflow, quantityChange ) quantity += quantityChange # Plot on graph x = np.arange( time ) y = np.arange( quantityChange ) plt.plot( x, y, label="rate of change" ) plt.ylabel( "Quantity" ) plt.xlabel( "Time" ) plt.show() [/code] I have picked up that neither a 'list' or an 'int' are iterable objects, but I am stymied by how I can successfully get the x and y axes to portray the data outputs. Also, what does that error message mean? That the starting point must be 0 or of the same object type? I haven't found a clear answer in the tutorial pages yet, but I will perservere. TIA AG x and y must be in the same length otherwise you hit that error message. try simply to see the failure: plt.plot([1,2], [1,2,3])Use len(x) or x.shape to see how many elements in the array and adjust your code to make x and y has the same length before plotting.-- Gökhan
That was very helpful, thank you Gökhan. Having played around with it a bit, I think I've got it fixed.
Thanks. AG
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