// // Copyright 2018 SenX S.A.S. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // package io.warp10.script.functions; import io.warp10.script.NamedWarpScriptFunction; import io.warp10.script.WarpScriptException; import io.warp10.script.WarpScriptStack; import io.warp10.script.WarpScriptStackFunction; import java.util.List; import org.apache.commons.math3.linear.MatrixUtils; import org.apache.commons.math3.linear.RealMatrix; import org.apache.commons.math3.linear.RealVector; /** * Converts a list of numbers into a vector */ public class TOVEC extends NamedWarpScriptFunction implements WarpScriptStackFunction { public TOVEC(String name) { super(name); } @Override public Object apply(WarpScriptStack stack) throws WarpScriptException { Object o = stack.pop(); if (o instanceof RealMatrix) { RealMatrix matrix = (RealMatrix) o; if (1 != matrix.getColumnDimension()) { throw new WarpScriptException(getName() + " expects a matrix with a single column on top of the stack."); } RealVector vector = matrix.getColumnVector(0); stack.push(vector); return stack; } if (!(o instanceof List)) { throw new WarpScriptException(getName() + " expects a list onto the stack."); } double[] data = new double[((List) o).size()]; for (int i = 0; i < data.length; i++) { Object oo = ((List) o).get(i); if (!(oo instanceof Number)) { throw new WarpScriptException(getName() + " expects a list of numbers onto the stack."); } data[i] = ((Number) oo).doubleValue(); } stack.push(MatrixUtils.createRealVector(data)); return stack; } }