move plotting stuff to own folder

programming/code/simplerandomwalk.m

@@ -0,0 +1,26 @@
+num_runs = 10;
+max_steps = 1000;
+
+positions = zeros(max_steps, num_runs);
+
+for run = 1:num_runs
+    for step = 2:max_steps
+        x = randn(1);
+        if x < 0
+            positions(step, run) = positions(step-1, run) + 1;
+        elseif x > 0
+            positions(step, run) = positions(step-1, run) - 1;
+        end
+    end
+end
+
+figure()
+hold on
+for run = 1:num_runs
+    plot(1:max_steps, positions(:, run))
+end
+xlabel('Number of steps')
+ylabel('Position')
+box off
+
+