I assume this is a regression problem, where you a number out of the SVM, and not a classification.
Neural networks are somewhat unique among models in that they can have multiple outputs. A SVM, when used for regression, has a single output. You can use a SVM to classify to multiple classes, however, for regression, you are limited to a single output.
If there are two different numbers that you are trying to predict, then you will need to use two SVM's. If you want to classify into multiple classes, there is more info here: http://www.heatonresearch.com/content/encog_svm_multiclass.html