The hold tag has no wiki summary.
14
votes
2answers
211 views
When should I, and when should I not, set the HoldAll attribute on a function I define?
I have seen a number of examples on this site
(such as in syntax highlighting and checking evaluation status) in which functions definitions are preceded with
...
13
votes
2answers
291 views
How to inject an evaluated expression into a held expression?
I know that there are methods to structurally manipulate held expressions (discussed e.g. here), but I failed to apply those for this particular problem:
...
11
votes
5answers
624 views
How to pass a symbolname to a function with any of the Hold attributes?
Given a function with the attribute HoldFirst, HoldAll or similar, and a variable, list, how ...
11
votes
1answer
143 views
Why are the attributes of Plot changing?
In version 9, with a newly started Mathematica session, try the following code:
...
11
votes
2answers
189 views
How can you stop ordering of InputField entries?
I have:
InputField[Dynamic[d]]
Dynamic[d]
If I enter e.g.
a b x^5 h m
the entry automatically gets sorted, as per screen ...
9
votes
2answers
355 views
Displaying a series obtained by evaluating a Taylor series
Description of problem
I would like to use Mathematica to display the series obtained by substituting a value for $x$ in a Taylor series expansion. The terms of the series will be rational numbers, ...
8
votes
1answer
110 views
Get the name of a symbol passed to a function
I'm trying to get the name of a symbol passed to a function with this:
f[x_] := {SymbolName[x], x}
SetAttributes[f, HoldFirst]
x = 5;
f[x]
But ...
5
votes
3answers
99 views
Applying a function with the HoldAll attribute inside NestList
I'm trying to write an update function, which can be applied to a list and then to NestList it.
As the function has to manipulate the given variable I figured I ...
4
votes
2answers
103 views
Confusing ReplaceRepeated & Hold
I've been bootstrapping myself to the very alien world of Mathematica and there came my first WTF moment:
...
3
votes
4answers
183 views
Make function return unevaluated equation
I have made this function which outputs the equation of a nth degree polynomial:
...
2
votes
1answer
112 views
Plot, HoldAll and the color problem
I have a similar problem as posted in Difference in Plot when using Evaluate vs when not using Evaluate, however due to a numerical evaluation I cannot use ...
1
vote
2answers
66 views
1
vote
1answer
98 views
direct assignment to the element in a Table
I have already asked a related question here why set values in this way doesn't work?
But I think I have to write the question which I encountered explicitly?
...
0
votes
1answer
48 views
Don't pollute outside context when solving equation from the outside
This code works fine only if a is not defined in the outside context:
...
0
votes
1answer
148 views
Make Mathematica wait before replacing?
How can I force Mathematica to completely evaluate a subexpression before using a replacement rule?
For example, consider the following definition (for the series of ...
