Added changeable X-Axis. Does not work for Fourier plot since the spectogram function does not support it.

Also added differentiation functions (not used yet).

diffPlotFnc.m

@@ -0,0 +1,63 @@
+function diffPlotFnc(data, fileSettings, checkboxes, start, stop, yAxis, xAxis, channels, path, order)
+    
+    %Iterate through all channels
+    for channel = 1:width(data)
+        
+        %If Graph is checked
+        if checkboxes{channel}.Value == 1
+
+            %Convert start and ending time
+            beginning = str2double(start{channel}.Value);
+            ending = str2double(stop{channel}.Value);
+    
+            %if first row increment is not checked
+            if fileSettings{2}.Value == 0
+                [timeArray, yData] = timeAxisWithIncrement(data, fileSettings{3}.Value, beginning, ending, channel); 
+            else
+                if ending == 0
+                    timeArray = data(:,1);
+                    yData = data(:, channel);
+                else
+
+                    timeIndex = 1;
+                    while data(timeIndex,1) < str2double(start{channel}.Value)
+                        timeIndex = timeIndex + 1;
+                    end
+    
+                    startIndex = timeIndex;
+    
+                    while data(timeIndex, 1) <= str2double(stop{channel}.Value) || timeIndex >= length(data)
+                        timeArray(timeIndex - startIndex + 1) = data(timeIndex,1);
+                        timeIndex = timeIndex + 1;
+                    end
+    
+                    endIndex = timeIndex;
+    
+                    for timeIndex = startIndex:endIndex - 1
+                        yData(timeIndex - startIndex + 1) = data(timeIndex, channel);
+                    end
+                end
+            end
+
+            %Plot the channel
+            figure(channel)
+            plot(timeArray, yData, '-b');
+            hold all
+            plot(timeArray, diff(yData), '-r');
+            ylabel(yAxis{channel}.Value);
+            xlabel(xAxis{channel}.Value);
+            legend('Original', 'Derivative')
+            title(channels{channel});
+            
+            %Save plot
+            saveFigs('median', figure(channel), channels(channel), path, fileSettings{1}.Value)
+            
+            %reset
+            hold off
+            close all;
+
+        end
+       
+    end    
+end
+