Show derivative of real and imag part

ExtraDifferential.py

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+# -*- coding: utf-8 -*-
+
+# Form implementation generated from reading ui file 'ExtraDifferential.ui'
+#
+# Created: Tue Jul 29 08:56:48 2014
+#      by: PyQt4 UI code generator 4.11.1
+#
+# WARNING! All changes made in this file will be lost!
+
+from PyQt4 import QtCore, QtGui
+
+try:
+    _fromUtf8 = QtCore.QString.fromUtf8
+except AttributeError:
+    def _fromUtf8(s):
+        return s
+
+try:
+    _encoding = QtGui.QApplication.UnicodeUTF8
+    def _translate(context, text, disambig):
+        return QtGui.QApplication.translate(context, text, disambig, _encoding)
+except AttributeError:
+    def _translate(context, text, disambig):
+        return QtGui.QApplication.translate(context, text, disambig)
+
+class Ui_Form(object):
+    def setupUi(self, Form):
+        Form.setObjectName(_fromUtf8("Form"))
+        Form.resize(668, 556)
+        self.horizontalLayout = QtGui.QHBoxLayout(Form)
+        self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
+        self.graphicsView = PlotWidget(Form)
+        self.graphicsView.setObjectName(_fromUtf8("graphicsView"))
+        self.horizontalLayout.addWidget(self.graphicsView)
+
+        self.retranslateUi(Form)
+        QtCore.QMetaObject.connectSlotsByName(Form)
+
+    def retranslateUi(self, Form):
+        Form.setWindowTitle(_translate("Form", "Form", None))
+
+from pyqtgraph import PlotWidget

ExtraDifferential.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Form</class>
+ <widget class="QWidget" name="Form">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>668</width>
+    <height>556</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <widget class="PlotWidget" name="graphicsView"/>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>PlotWidget</class>
+   <extends>QGraphicsView</extends>
+   <header>pyqtgraph</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>