# toggle and elseif in matlab

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Shivaani S il 4 Mag 2020
Commentato: Walter Roberson il 16 Ago 2024 alle 23:16
Try adding a variable doDisplay to toggle if the densities are displayed. Add this condition with an elseif block.
i do not understand what we are supposed to do in the above question(bold). this question is a part of futher practice in mathlab oramp. decision branching topic futher practice section in matworks course for basic matlab. how do i solve tha bove question
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Misbah Rafi Farooqui il 27 Lug 2020
write "doPlot>=1"

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### Risposta accettata

Geoff Hayes il 4 Mag 2020
Shivaani - I think that all the code is asking you to do is to add another variable called doDisplay and an elseif that would check if this variable is true. If so, then you would plot the densities. So there would be two ways to plot the data - either through the doPlot or with the doDisplay
if doPlot
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
else
disp("The density of " + element ...
+ " is " + density)
end
You would need to declare and initialize the doDisplay variable too.
##### 4 CommentiMostra 2 commenti meno recentiNascondi 2 commenti meno recenti
Geoff Hayes il 5 Mag 2020
I'm not sure then...I added the above code and was able to proceed/pass. Are you sure that you have defined doDisplay?
Elisa R il 4 Ago 2020
This is what I did. I ran it numerous times. both doPlot and doDisplay have to be 0 in this scenario in order for the text to display instead of the plot.
doPlot = randi([0 1])
density = data(:,1);
doDisplay = randi([0 1])
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
else
disp("The density of " + element ...
+ " is " + density)
end

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### Più risposte (9)

Varot Pakavatsoontorn il 1 Mag 2021
Hi, I think the instructor might mean the following:
doDisplay = 1-doPlot
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
disp("The density of " + element ...
+ " is " + density)
end
##### 2 CommentiMostra NessunoNascondi Nessuno
Simone Silva il 7 Mar 2022
Hi.
The instructor asks what hapenned when doPlot and doDisplay are both equal one or they both equal zero.
If we define doDisplay=1-doPlot, the cases above are not possible.
Rik il 7 Apr 2022
Comment posted as flag by ANAHITA SOLTANTOUYEH:
This is imo the best interpretation of the task at hand and a great solution.

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Saif Alameri il 26 Ago 2022
My interpretation to this practice is to create another variable (doDisplay) with random number (0 or 1) just like the (doPlot), then use it as a second condtion for (elseif):
doPlot = randi([0 1])
doDisplay=randi([0 1])
density = data(:,1);
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
disp("The density of " + element + " is " + density)
end
When:
doPlot = 0 and doDisplay = 0, then nothing displaied
doPlot = 1 and doDisplay = 0, then plot displaied
doPlot = 0 and doDisplay = 1, then density displaied
doPlot = 1 and doDisplay = 1, then only plot displaied
The point of this practice is to explain that second condtion will executing only when it met it's condtion and first condtion is not.
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DGM il 16 Ago 2024 alle 23:14
I think this is the correct and most direct interpretation of the instructions. I can see why a person would be confused though, as it doesn't really make sense to use if/elseif for this. To me, it would be more sensible to do
if doPlot
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
end
if doDisplay
disp("The density of " + element + " is " + density)
end
Otherwise, there's not really any point in using multiple flags to control the behavior. As much as I think it's better, this isn't what the instructions describe.

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Kakasaheb Nikam il 14 Mag 2020
a Simple trick that i follow is,
at beginning I also not understand,
so we read it thrice by breaking sentance.
apply simple common logic.
we understand it.
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Joanne Middour il 13 Feb 2021
This is the way I did it because I was under the impression that they are asking us to do recursion here, but I may be wrong.
doDisplay = randi([0 1])
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
doPlot = 1
else
disp("The density of " + element ...
+ " is " + density)
end
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ABINESH R il 2 Lug 2022
they are also asking what happens when they both equal zero, or when only doDisplay equals one?What's the ans for this

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sai il 4 Apr 2021
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay
disp("The density of " + element ...
+ " is " + density)
end
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kunku S M il 3 Feb 2022
try this, i think it's the answer
doDisplay=randi([0 1])
if doPlot == 0
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
disp("The density of " + element ...
+ " is " + density)
end
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Majdy il 6 Nov 2022
doDisplay=randi([0,1])
doPlot=randi([0,1])
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
disp("The density of " + element+ " is " + density)
end
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Hojiboy il 15 Mag 2023
doDisplay = 1-doPlot
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay == 1
disp("The density of " + element ...
+ " is " + density)
end
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Modificato: Muhammad il 8 Ago 2024
I have tried: Here we can test what happens when both are equal to 1 or zero or only doDisplay is equal to 1. Nothing happens when both are equal to zero. When both are equal to 1, graph is printed. When only doDisplay is 1, it displays the densities. But still seems to be tricky quetion.
doPlot = randi([0 1])
doDisplay = randi([0 1])
density =
if doPlot == 1
plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif doDisplay ~= doPlot
disp("The dinsity of " + element ...
+ " is " + density)
else
doPlot
doDisplay
end
doPlot = 1
doDisplay = 0
Unrecognized function or variable 'density'.
##### 1 CommentoMostra -1 commenti meno recentiNascondi -1 commenti meno recenti
Walter Roberson il 16 Ago 2024 alle 23:16
density =
That line is not valid MATLAB syntax.

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