Create a loop with decrementing step

Question

Dennis M 2021-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/1440439-create-a-loop-with-decrementing-step

评论： Dennis M 2021-9-2

Good Day, May I ask a question, how can I create loop that the output is like this (10 20 29 38 47 56 65 and so on) and (80 70 61 53 46 40 35 and so on) same in negative (-10 -20 -29 -38 -47 -56 -65 and so on) and (-80 -70 -61 -53 -46 -40 -35 and so on)

Thanks

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Answer 1

the cyclist 2021-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/1440439-create-a-loop-with-decrementing-step#answer_774144

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Do you mean that you want the increment to be 10, 9, 8, ...? (That is not what your first example does). Here is one way to do a series like that. I hope you can generalize to what you need.

inc = 10:-1:1;
step = cumsum(inc)
step = 1×11
    10    19    27    34    40    45    49    52    54    55    55

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the cyclist 2021-8-27

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I would suggest that you really try to understand my other solution. If you did, then it is trivial how to figure out this question.

inc = -10:1:1;
step = cumsum([80 inc])
step = 1×13
    80    70    61    53    46    40    35    31    28    26    25    25    26

I suggest you study the MATLAB Onramp online tutorial. You will learn how to do simple tasks like this one.

Dennis M 2021-9-2

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Good Day,

Sir The Cyclist,

Here's my script please check if there's improvement, thanks

clear all
format compact
finalstep = 0.125;
%% 
starta = 20; 
stopa = 30;
hysa = abs(stopa - starta);
stastep = hysa * 0.2;
stepa = linspace(finalstep,stastep,hysa);
A = stopa - cumsum([0 stepa]);
A = A(A >= starta);
intermediatesa = flipud(A.').';
for loop_variablea = intermediatesa
   %body of the loop goes here
   a = loop_variablea
end
%%
startb = 15; 
stopb = 5;
hysb = abs(stopb - startb);
stastep = hysb * 0.2;
stepb = linspace(finalstep,stastep,hysb);
B = stopb + cumsum([0 stepb]);
B = B( B <= startb);
intermediatesb = flipud(B.').';
for loop_variableb = intermediatesb
   %body of the loop goes here
   b = loop_variableb
end
%%
startx = -20; 
stopx = -30;
hysx = abs(stopx - startx);
stastep = hysx * 0.2;
stepx = linspace(finalstep,stastep,hysx);
X = stopx + cumsum([0 stepx]);
X = X(X <= startx);
intermediatesx = flipud(X.').';
for loop_variablex = intermediatesx
   %body of the loop goes here
   x = loop_variablex
end
%%
starty = -15; 
stopy = -5;
hysy = abs(stopy - starty);
stastep = hysy * 0.2; % start step
stepy = linspace(finalstep,stastep,hysy);
Y = stopy - cumsum([0 stepy]);
Y = Y(Y >= starty);
intermediatesy = flipud(Y.').';
for loop_variabley = intermediatesy
   %body of the loop goes here
   y = loop_variabley
end