correct behaviour for logplots when only y is given

Cryoris · Cryoris · commit 6d3c54ec21a9 · 2019-06-10T19:09:46.000+02:00
had x = 1...N before to avoid problems with x=0 but matplotlib states it 
should still be x = 0...N-1
diff --git a/matplotlibcpp.h b/matplotlibcpp.h
@@ -534,7 +534,7 @@ bool loglog(const VectorY &y, const std::string &s = "",
             const std::map<std::string, std::string> &keywords = {}) {
   std::vector<std::size_t> x(y.size());
   for (std::size_t i = 0; i < x.size(); ++i)
-    x.at(i) = i + 1; // in loglog scale the values shouldn't be zero
+    x.at(i) = i;
 
   return loglog(x, y, s, keywords);
 }
@@ -544,7 +544,7 @@ bool loglog(const VectorY &y,
             const std::map<std::string, std::string> &keywords) {
   std::vector<std::size_t> x(y.size());
   for (std::size_t i = 0; i < x.size(); ++i)
-    x.at(i) = i + 1; // in loglog scale the values shouldn't be zero
+    x.at(i) = i;
 
   return loglog(x, y, "", keywords);
 }
@@ -568,7 +568,7 @@ bool semilogx(const VectorY &y, const std::string &s = "",
               const std::map<std::string, std::string> &keywords = {}) {
   std::vector<std::size_t> x(y.size());
   for (std::size_t i = 0; i < x.size(); ++i)
-    x.at(i) = i + 1; // in semilogx scale the values shouldn't be zero
+    x.at(i) = i;
 
   return semilogx(x, y, s, keywords);
 }
@@ -578,7 +578,7 @@ bool semilogx(const VectorY &y,
               const std::map<std::string, std::string> &keywords) {
   std::vector<std::size_t> x(y.size());
   for (std::size_t i = 0; i < x.size(); ++i)
-    x.at(i) = i + 1; // in semilogx scale the values shouldn't be zero
+    x.at(i) = i;
 
   return semilogx(x, y, "", keywords);
 }
@@ -602,7 +602,7 @@ bool semilogy(const VectorY &y, const std::string &s = "",
               const std::map<std::string, std::string> &keywords = {}) {
   std::vector<std::size_t> x(y.size());
   for (std::size_t i = 0; i < x.size(); ++i)
-    x.at(i) = i + 1; // in semilogx scale the values shouldn't be zero
+    x.at(i) = i;
 
   return semilogy(x, y, s, keywords);
 }
@@ -612,7 +612,7 @@ bool semilogy(const VectorY &y,
               const std::map<std::string, std::string> &keywords) {
   std::vector<std::size_t> x(y.size());
   for (std::size_t i = 0; i < x.size(); ++i)
-    x.at(i) = i + 1; // in semilogx scale the values shouldn't be zero
+    x.at(i) = i;
 
   return semilogy(x, y, "", keywords);
 }
