+- if (!(yvalue[i]=='q' or yvalue[i]=='w' or yvalue[i]=='e' or yvalue[i]=='r' or yvalue[i]=='t' or yvalue[i]=='y' or yvalue[i]=='u' or yvalue[i]=='i' or yvalue[i]=='o' or yvalue[i]=='p' or yvalue[i]=='a' or yvalue[i]=='s' or yvalue[i]=='d' or yvalue[i]=='f' or yvalue[i]=='g' or yvalue[i]=='h' or yvalue[i]=='j' or yvalue[i]=='k' or yvalue[i]=='l' or yvalue[i]=='z' or yvalue[i]=='x' or yvalue[i]=='c' or yvalue[i]=='v' or yvalue[i]=='b' or yvalue[i]=='n' or yvalue[i]=='m' or yvalue[i]=='+' or yvalue[i]=='-' or yvalue[i]=='^' or yvalue[i]=='*' or yvalue[i]=='/' or yvalue[i]=='(' or yvalue[i]==')' or yvalue[i]=='Q' or yvalue[i]=='W' or yvalue[i]=='E' or yvalue[i]=='R' or yvalue[i]=='T' or yvalue[i]=='Y' or yvalue[i]=='U' or yvalue[i]=='I' or yvalue[i]=='O' or yvalue[i]=='P' or yvalue[i]=='A' or yvalue[i]=='S' or yvalue[i]=='D' or yvalue[i]=='F' or yvalue[i]=='G' or yvalue[i]=='H' or yvalue[i]=='J' or yvalue[i]=='K' or yvalue[i]=='L' or yvalue[i]=='Z' or yvalue[i]=='X' or yvalue[i]=='C' or yvalue[i]=='V' or yvalue[i]=='B' or yvalue[i]=='N' or yvalue[i]=='M' or yvalue[i]=='1' or yvalue[i]=='2' or yvalue[i]=='3' or yvalue[i]=='4' or yvalue[i]=='5' or yvalue[i]=='6' or yvalue[i]=='7' or yvalue[i]=='8' or yvalue[i]=='9' or yvalue[i]=='0' or yvalue[i]=='.' or yvalue[i]==',')) {
+ break; //if current value is not a permitted value, this means that something is wrong
+ }
+- if (yvalue[i]=='q' or yvalue[i]=='w' or yvalue[i]=='e' or yvalue[i]=='r' or yvalue[i]=='t' or yvalue[i]=='y' or yvalue[i]=='u' or yvalue[i]=='i' or yvalue[i]=='o' or yvalue[i]=='p' or yvalue[i]=='a' or yvalue[i]=='s' or yvalue[i]=='d' or yvalue[i]=='f' or yvalue[i]=='g' or yvalue[i]=='h' or yvalue[i]=='j' or yvalue[i]=='k' or yvalue[i]=='l' or yvalue[i]=='z' or yvalue[i]=='x' or yvalue[i]=='c' or yvalue[i]=='v' or yvalue[i]=='b' or yvalue[i]=='n' or yvalue[i]=='m' or yvalue[i]=='Q' or yvalue[i]=='W' or yvalue[i]=='E' or yvalue[i]=='R' or yvalue[i]=='T' or yvalue[i]=='Y' or yvalue[i]=='U' or yvalue[i]=='I' or yvalue[i]=='O' or yvalue[i]=='P' or yvalue[i]=='A' or yvalue[i]=='S' or yvalue[i]=='D' or yvalue[i]=='F' or yvalue[i]=='G' or yvalue[i]=='H' or yvalue[i]=='J' or yvalue[i]=='K' or yvalue[i]=='L' or yvalue[i]=='Z' or yvalue[i]=='X' or yvalue[i]=='C' or yvalue[i]=='V' or yvalue[i]=='B' or yvalue[i]=='N' or yvalue[i]=='M' or yvalue[i]=='.' or yvalue[i]==',') {
+ lettere = 1; //if lettere == 0 then the equation contains only mnumbers
+ }
+- if (yvalue[i]=='+' or yvalue[i]=='-' or yvalue[i]=='^' or yvalue[i]=='*' or yvalue[i]=='/' or yvalue[i]=='(' or yvalue[i]==')' or yvalue[i]=='1' or yvalue[i]=='2' or yvalue[i]=='3' or yvalue[i]=='4' or yvalue[i]=='5' or yvalue[i]=='6' or yvalue[i]=='7' or yvalue[i]=='8' or yvalue[i]=='9' or yvalue[i]=='0' or yvalue[i]=='.' or yvalue[i]==',') {
+- if (yvalue[i]=='+' or yvalue[i]=='-' or yvalue[i]=='^' or yvalue[i]=='*' or yvalue[i]=='/' or yvalue[i]=='(' or yvalue[i]==')' or yvalue[i]=='1' or yvalue[i]=='2' or yvalue[i]=='3' or yvalue[i]=='4' or yvalue[i]=='5' or yvalue[i]=='6' or yvalue[i]=='7' or yvalue[i]=='8' or yvalue[i]=='9' or yvalue[i]=='0' or yvalue[i]=='.' or yvalue[i]==',') {
+- if (!(yvalue[i]=='q' or yvalue[i]=='w' or yvalue[i]=='e' or yvalue[i]=='r' or yvalue[i]=='t' or yvalue[i]=='y' or yvalue[i]=='u' or yvalue[i]=='i' or yvalue[i]=='o' or yvalue[i]=='p' or yvalue[i]=='a' or yvalue[i]=='s' or yvalue[i]=='d' or yvalue[i]=='f' or yvalue[i]=='g' or yvalue[i]=='h' or yvalue[i]=='j' or yvalue[i]=='k' or yvalue[i]=='l' or yvalue[i]=='z' or yvalue[i]=='x' or yvalue[i]=='c' or yvalue[i]=='v' or yvalue[i]=='b' or yvalue[i]=='n' or yvalue[i]=='m' or yvalue[i]=='+' or yvalue[i]=='-' or yvalue[i]=='^' or yvalue[i]=='*' or yvalue[i]=='/' or yvalue[i]=='(' or yvalue[i]==')' or yvalue[i]=='Q' or yvalue[i]=='W' or yvalue[i]=='E' or yvalue[i]=='R' or yvalue[i]=='T' or yvalue[i]=='Y' or yvalue[i]=='U' or yvalue[i]=='I' or yvalue[i]=='O' or yvalue[i]=='P' or yvalue[i]=='A' or yvalue[i]=='S' or yvalue[i]=='D' or yvalue[i]=='F' or yvalue[i]=='G' or yvalue[i]=='H' or yvalue[i]=='J' or yvalue[i]=='K' or yvalue[i]=='L' or yvalue[i]=='Z' or yvalue[i]=='X' or yvalue[i]=='C' or yvalue[i]=='V' or yvalue[i]=='B' or yvalue[i]=='N' or yvalue[i]=='M' or yvalue[i]=='1' or yvalue[i]=='2' or yvalue[i]=='3' or yvalue[i]=='4' or yvalue[i]=='5' or yvalue[i]=='6' or yvalue[i]=='7' or yvalue[i]=='8' or yvalue[i]=='9' or yvalue[i]=='0' or yvalue[i]=='.' or yvalue[i]==',')) {
+ break; //if current value is not a permitted value, this means that something is wrong
+ }
+- if (yvalue[i]=='q' or yvalue[i]=='w' or yvalue[i]=='e' or yvalue[i]=='r' or yvalue[i]=='t' or yvalue[i]=='y' or yvalue[i]=='u' or yvalue[i]=='i' or yvalue[i]=='o' or yvalue[i]=='p' or yvalue[i]=='a' or yvalue[i]=='s' or yvalue[i]=='d' or yvalue[i]=='f' or yvalue[i]=='g' or yvalue[i]=='h' or yvalue[i]=='j' or yvalue[i]=='k' or yvalue[i]=='l' or yvalue[i]=='z' or yvalue[i]=='x' or yvalue[i]=='c' or yvalue[i]=='v' or yvalue[i]=='b' or yvalue[i]=='n' or yvalue[i]=='m' or yvalue[i]=='Q' or yvalue[i]=='W' or yvalue[i]=='E' or yvalue[i]=='R' or yvalue[i]=='T' or yvalue[i]=='Y' or yvalue[i]=='U' or yvalue[i]=='I' or yvalue[i]=='O' or yvalue[i]=='P' or yvalue[i]=='A' or yvalue[i]=='S' or yvalue[i]=='D' or yvalue[i]=='F' or yvalue[i]=='G' or yvalue[i]=='H' or yvalue[i]=='J' or yvalue[i]=='K' or yvalue[i]=='L' or yvalue[i]=='Z' or yvalue[i]=='X' or yvalue[i]=='C' or yvalue[i]=='V' or yvalue[i]=='B' or yvalue[i]=='N' or yvalue[i]=='M' or yvalue[i]=='.' or yvalue[i]==',') {
+ tempy = tempy + yvalue[i]; //if lettere == 0 then the equation contains only mnumbers
+ }
+- if (yvalue[i]=='+' or yvalue[i]=='-' or yvalue[i]=='^' or yvalue[i]=='*' or yvalue[i]=='/' or yvalue[i]=='(' or yvalue[i]==')' or yvalue[i]=='1' or yvalue[i]=='2' or yvalue[i]=='3' or yvalue[i]=='4' or yvalue[i]=='5' or yvalue[i]=='6' or yvalue[i]=='7' or yvalue[i]=='8' or yvalue[i]=='9' or yvalue[i]=='0' or yvalue[i]=='.' or yvalue[i]==',') {
+- if (((olda != 1) and (yvalue[i + 1] != '^')) or (yvalue[i] == '+' or yvalue[i] == '-' or yvalue[i] == '^' or yvalue[i] == '*' or yvalue[i] == '/' or yvalue[i] == '(' or yvalue[i] == ')')) {
+- if ((tablea == 1) and (tempyval != QString("table1")) and (tempyval != QString("table2")) and (tempyval != QString("xaxis")) and (tempyval != QString("yaxis")) and (tempyval != QString("note"))) {
+- if ((tableb == 1) and (tempyval != QString("table1")) and (tempyval != QString("table2")) and (tempyval != QString("xaxis")) and (tempyval != QString("yaxis")) and (tempyval != QString("note"))) {
+- if ((xax == 1) and (tempyval != QString("table1")) and (tempyval != QString("table2")) and (tempyval != QString("xaxis")) and (tempyval != QString("yaxis")) and (tempyval != QString("note"))) {
+- if ((yax == 1) and (tempyval != QString("table1")) and (tempyval != QString("table2")) and (tempyval != QString("xaxis")) and (tempyval != QString("yaxis")) and (tempyval != QString("note"))) {
+- if ((notea == 1) and (tempyval != QString("table1")) and (tempyval != QString("table2")) and (tempyval != QString("xaxis")) and (tempyval != QString("yaxis")) and (tempyval != QString("note"))) {