# Was doing some MATLAB homework and couldn't get a graph to come up just a table was looking for some help.

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evan melanson 2021 年 11 月 18 日
コメント済み: Image Analyst 2021 年 11 月 21 日
3. (35 pts) Table and Graph. Write a MATLAB program (script or .m file) to create a table showing radius R
and volume V for a sphere as R varies from 0 cm to 50 cm. Also graph volume vs radius. Specifically:
Write a MATLAB program (script or .m file).
Begin with the block of comments as described above. Add other comments throughout the program.
Use a range variable to assign the values of R from 0 to 50 cm in increments of 5 cm.
Use a formula on the vector above to create another vector for the volume of the sphere. Note that a dot
operation will be required.
Combine the transpose of the two vectors to create a new vector (table).
Display the problem number and your name before displaying the table.
Display the table and include a table heading (with units).
No special formatting is required for this problem.
Extra credit: Use fprintf to use 0 digits after the decimal point for the radius and 2 digits after the
decimal point for the volume.
Form a graph of volume vs radius. Add major gridlines. Label the axes. Add a title.
Print the script, the output table, and the graph.
This is my homework instructions and bellow is the code that i have.
R = 0:5:50;
V = 4/3*pi*R.^3;
sTable = [R' V'];
disp('HW #6 - Evan Melanson')
HW #6 - Evan Melanson
disp('Problem #3')
Problem #3
colNames = {'R','V'};
disp('Radius R (cm) | Volume V (cm^3)')
Radius R (cm) | Volume V (cm^3)
fprintf([repmat('\t %.2f \t', 1, size(sTable,2)) '\n'], sTable');
0.00 0.00 5.00 523.60 10.00 4188.79 15.00 14137.17 20.00 33510.32 25.00 65449.85 30.00 113097.34 35.00 179594.38 40.00 268082.57 45.00 381703.51 50.00 523598.78
plot(R,V)
xlabel('R (cm)')
ylabel('V (cm^3)') ##### 2 件のコメント表示非表示 1 件の古いコメント
evan melanson 2021 年 11 月 18 日
Thank you so much i think it is too but thanks for the information i thought i had done something wrong.

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### 回答 (1 件)

Prateek Rai 2021 年 11 月 21 日
Hi,
You can use the "figure" function before "plot" to create a figure window for your graph.
Your code will look like:
figure(1)
plot(R,V)
xlabel('R (cm)')
ylabel('V (cm^3)')
You can refer to the figure MathWorks documentation page to find more on creating a figure window.
##### 1 件のコメント表示非表示 なし
Image Analyst 2021 年 11 月 21 日
Not sure why that's needed. In my experience (regular desktop MATLAB) if you plot something with no figure yet showing, it will automatically create a figure for you.

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