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Results tagged with procedural-programming
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user 46318
Questions about Mathematica's procedural programming paradigm.
4
votes
Accepted
Query in For loop
there are several things wrong:
The "Continue[]" is not needed
You need 2 closing brackets at the end.
y1 should be a vector with values. y[[1]],y[[2]], y[[3] are not specified
I added two print s …
- 56.4k
3
votes
Accepted
An example code for doing a loop
First we define the conditions:
Clear["Global`*"];
list = {a, b, c, d};
f1[a] = 0;
f1[b] = 0;
f1[f2[c]] = 0;
f1[f2[f2[d]]] = 0;
Then we apply the 3 steps. The result is accumulated by Sow/Reap in the …
- 56.4k
3
votes
Accepted
While loop not working problem
Commands in MMA are capitalized. You need "While" and "If". Then s and sum are 2 different variables.
Here is your corrected code:
sum = 0;
i = 0;
While[Fibonacci[i] <= 2000000,
If[OddQ[Fibonacci[i …
- 56.4k
3
votes
Quit the loop if encounter error message
Loops are seldom used in MMA. Most of the time loops ca be avoided and replaced by more efficient constructs. However, if you insist on using loops:
At the start of the loop you already know the lengt …
- 56.4k
3
votes
Generating a $N^{th}$ iterative line graph from the adjacency matrix $M$. How to generate $M$?
Consider the cells as a grid. Then the 0 generations has the coordinates: {0,0}. The first generation has coordinates: {-1,0},{1,0},{0,-1},{0,1}. The second generation: {-2,0},{-1,1},.. Note that the …
- 56.4k
2
votes
Optimizing operations between vectors
Instead of creating a space grid, we simply imply integer coordinates from 0 to n. E.g. {0,0,0} indicates the cell at the origin. {1,0,0} the next cell along the x axis etc. Then we can get the cell n …
- 56.4k
2
votes
Trying to apply numerical method with Do
Your algorithm has a bug.
Look at your function Fa1n and consider: ClearFa1n]; Fa1n[0,0]::
First, it sets Fa1n[0,0]=0, Fa1n[0,-1]=0 and then Fa1n[0,1]= Fa1n[0,0]+Fa1n[1,0]. However Fa1n[1,0] is not ye …
- 56.4k
2
votes
Superimposed data on top of each other in a Do Loop
In MMA using Loops is not advised. Instead, use Map and a function. Here is the procedure.
Assume that we want to overlay dataset2, dataset3,.. onto dataset1
We again need data:
dat = Import["https:// …
- 56.4k
2
votes
How to change numbers in variables defined with a loop?
If you want the side effects of the list, not the list itself:
Clear["Globals`*"]
fun[n_] :=
ToExpression[
ToString[
StringForm[
"r`1`i=fuv`1`[w`1`]+fuv`1`'[w`1`] \
(c-w`1`);r`1`f=fuv`1` …
- 56.4k
1
vote
Superimposed data on top of each other in a Do Loop
After importing your data, I needed some fixes to convert it to numerical data:
dat = Import["https://pastebin.com/j3Bgfxqm", "Data"][[1]];
dat = ToExpression[ StringCases[#,
"{" ~~ NumberStrin …
- 56.4k
1
vote
Do loop so that I do not get double terms?
Often a problem is easier, seen from another perspective.
You have different quantum states, specified by 3 integers. We may e.g. represent these as lists:
states=Flatten[Array[{#1, #2, #3} &, {3, 3, …
- 56.4k
1
vote
Sorting a list by increasing order algorythm
First, loops are seldom needed in MMA, there are more efficient operators for this, e.g. "Map".
Second, your algorithm does not order the list. After the first round, the smallest element is at the be …
- 56.4k