def ExecLine(s):
l = s.split()
if len(l) == 0:
return None
elif s == "help":
print(" ----- HELP -----")
print()
print(" $... = parameter")
print(" [...] = optional parameter")
print()
print(" Commands:")
print()
print(
" var $name $expression --> define a variable with the value of expression"
)
print(" func $name $definition --> define a function")
print(" plot $function [A=-10] [B=10] --> plot a function")
print(" exit [expression] --> close the program")
print(" print [expression] --> print an expression")
print(
" message [string] --> print an expression literal message"
)
print(
" read --> read an expression from standard input"
)
print(
" vread $name --> read a variable from standard input"
)
print(
" fread $name --> read a function from standard input"
)
print(
" exec $file --> open a file and execute it"
)
print(" help --> show this help")
print()
return None
elif l[0] == "exit":
if len(l) == 1:
exit()
ns = "".join(l[1:])
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
exit(Calculate.Calculate(ns))
elif l[0] == "func":
if len(l) < 3:
raise Exception("MyMath : invalid arguments of command 'function'")
fname = l[1]
if Calculate.IsReal(fname):
raise Exception(
"MyMath : a number can not be a name of a function")
ns = "".join(l[2:])
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
Calculate.functions[fname] = []
f = Function.GenerateFunction(ns)
Calculate.functions[fname] = [Function.ToPythonFunc(f), 1]
localfuncs[fname] = [f, ns]
return None
elif l[0] == "plot":
if len(l) != 2 and len(l) != 4:
raise Exception("MyMath : invalid arguments of command 'plot'")
literal = ""
func = 0
if l[1] in localfuncs:
literal = localfuncs[l[1]][1]
func = localfuncs[l[1]][0]
elif l[1] in Calculate.functions:
literal = l[1] + "(x)"
if Calculate.functions[l[1]][1] > 1:
raise Exception(
"MyMath : the built-in function '", l[1],
"' can not be plotted besause needs more than 1 parameter")
func = Function.GenerateFunction(literal)
else:
raise Exception("MyMath : '" + l[1] +
"' is not defined as function")
A = -10
B = 10
if len(l) == 4:
for v in localvars:
l[2] = l[2].replace(v, str(localvars[v]))
for v in localvars:
l[3] = l[3].replace(v, str(localvars[v]))
A = int(l[2])
B = int(l[3])
print("Drawing '", l[1], "(x) = ", literal, "' , wait...", sep='')
Plot.FuncPlot(func, A, B)
print("Plot closed")
return None
elif l[0] == "var":
if len(l) < 2:
raise Exception("MyMath : invalid arguments of command 'var'")
if l[1] == "x":
raise Exception(
"MyMath : 'x' can not be declared as a local variable")
if Calculate.IsReal(l[1]):
raise Exception(
"MyMath : a number can not be a name of a variable")
if len(l) == 2:
localvars[l[1]] = 0.0
return None
ns = "".join(l[2:])
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
localvars[l[1]] = Calculate.Calculate(ns)
return None
elif l[0] == "read":
if len(l) != 1:
raise Exception("MyMath : invalid arguments of command 'read'")
ns = input()
nl = ns.split()
if len(nl) == 0:
return None
if len(nl) == 1:
if nl[0] in localfuncs:
return ("Local function defined as '" + nl[0] + "(x) := " +
localfuncs[nl[0]][1] + "'")
elif nl[0] in Calculate.functions:
return ("Built-in function with " +
Calculate.functions[nl[0]][1] + " parameters")
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
return Calculate.Calculate(ns)
elif l[0] == "vread":
if len(l) != 2:
raise Exception("MyMath : invalid arguments of command 'vread'")
if l[1] == "x":
raise Exception(
"MyMath : 'x' can not be declared as a local variable")
if Calculate.IsReal(l[1]):
raise Exception(
"MyMath : a number can not be a name of a variable")
ns = input()
if ns.isspace():
localvars[l[1]] = 0.0
return None
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
localvars[l[1]] = Calculate.Calculate(ns)
return None
elif l[0] == "fread":
if len(l) != 2:
raise Exception("MyMath : invalid arguments of command 'fread'")
fname = l[1]
if Calculate.IsReal(fname):
raise Exception(
"MyMath : a number can not be a name of a function")
ns = input()
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
f = Function.GenerateFunction(ns)
Calculate.functions[fname] = [Function.ToPythonFunc(f), 1]
localfuncs[fname] = [f, ns]
return None
if l[1] == "x":
raise Exception(
"MyMath : 'x' can not be declared as a local variable")
if Calculate.IsReal(l[1]):
raise Exception(
"MyMath : a number can not be a name of a variable")
ns = input()
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
localvars[l[1]] = Calculate.Calculate(ns)
return None
elif l[0] == "message":
ns = s[len("message") + 1:]
nns = ns[0]
for i in range(1, len(ns)):
if nns[len(nns) - 1] == "\\" and ns[i] == "\\":
continue
elif nns[len(nns) - 1] == "\\" and ns[i] == "n":
nns = nns[:len(nns) - 1] + "\n"
elif nns[len(nns) - 1] == "\\" and ns[i] == "t":
nns = nns[:len(nns) - 1] + "\t"
else:
nns += ns[i]
print(nns, end="")
elif l[0] == "print":
if len(l) < 2:
raise Exception("MyMath : invalid arguments of command 'print'")
if len(l) == 2:
if l[1] in localfuncs:
print(localfuncs[l[1]][1])
return None
elif l[1] in Calculate.functions:
print(l[1])
return None
ns = "".join(l[1:])
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
print(Calculate.Calculate(ns))
elif l[0] == "exec":
if len(l) != 2:
raise Exception("MyMath : invalid arguments of command 'exec'")
st = open(l[1], "r").read()
fl = st.splitlines()
for item in fl:
ExecLine(item)
return None
else:
if len(l) == 1:
if l[0] in localfuncs:
return ("Local function defined as '" + l[0] + "(x) := " +
localfuncs[l[0]][1] + "'")
elif l[0] in Calculate.functions:
return ("Built-in function with " +
Calculate.functions[l[0]][1] + " parameters")
ns = s
for v in localvars:
ns = ns.replace(v, str(localvars[v]))
return Calculate.Calculate(ns)
#oppure in modo compatto
Calculate.Calculate(s)
import Function
s = "exp(x)"
f = Function.GenerateFunction(s)
val = Function.InvokeFunction(f, 1)
print("e =", val)
#o in modo analogo
pyf = Function.ToPythonFunc(f)
val = pyf(1)
print("e =", val)
import Plot
Plot.FuncPlot(f, -10, 10)
#oppure in modo compatto
Plot.Plot("exp(x)")
